Medical School · Year 3 · Pediatrics · includes a quiz and discussion video

Seminar 02: Newborn Care

Year 3: Pediatrics Clerkship

Learning Objectives

By the end of this seminar, students will be able to:

1. Perform the newborn physical examination
2. Apply newborn screening and immunization protocols
3. Recognize common newborn problems
4. Evaluate and manage neonatal jaundice
5. Describe normal newborn transition and adaptation
6. Counsel parents on newborn care

I. Newborn Transition

The transition from intrauterine to extrauterine life represents one of the most dramatic physiological adaptations in human development, requiring successful completion of respiratory, circulatory, and metabolic changes within minutes of birth. In utero, the fetal lungs are filled with approximately 30 milliliters per kilogram of lung fluid that must be rapidly cleared to establish effective gas exchange. The first breath generates negative intrathoracic pressures of 40 to 80 centimeters of water, sufficient to expand alveoli and establish functional residual capacity. Surfactant, produced by type II pneumocytes beginning around 24 weeks gestation, reduces alveolar surface tension and prevents collapse during expiration, making this transition possible.

Circulatory adaptation involves dramatic changes in vascular resistance and closure of fetal shunts that previously bypassed the pulmonary circulation. With the first breath and expansion of the lungs, pulmonary vascular resistance falls dramatically, allowing blood flow through the pulmonary circulation for oxygenation. Simultaneously, clamping of the umbilical cord removes the low-resistance placental circulation, increasing systemic vascular resistance. The ductus arteriosus, which shunted blood from the pulmonary artery to the aorta in fetal life, begins to constrict within hours of birth in response to increased oxygen tension and decreased prostaglandin levels, achieving functional closure typically within 24 to 48 hours.

Thermoregulation presents an immediate challenge for newborns due to their large surface area to body mass ratio, thin subcutaneous fat layer, and limited ability to generate heat through shivering. Heat loss occurs through evaporation, convection, conduction, and radiation, with evaporative losses being particularly significant immediately after delivery when the infant is wet with amniotic fluid. Brown adipose tissue, located primarily in the interscapular region, neck, and perirenal areas, enables non-shivering thermogenesis through uncoupled oxidative phosphorylation. Prevention of hypothermia requires immediate drying after delivery, skin-to-skin contact with the mother, warm blankets, and maintenance of appropriate environmental temperature.

Glucose homeostasis requires rapid metabolic adaptation as the continuous transplacental glucose supply is abruptly discontinued at birth. The healthy term newborn has glycogen stores in the liver and brown fat that can be mobilized to maintain blood glucose during the first hours of life. Normal blood glucose in newborns remains somewhat controversial, but values below 40 to 45 milligrams per deciliter are generally considered hypoglycemic and warrant intervention. Risk factors for neonatal hypoglycemia include small for gestational age, large for gestational age, infants of diabetic mothers, and preterm infants, all of whom require glucose monitoring protocols. Early and frequent feeding helps maintain glucose homeostasis and should be initiated within the first hour of life when possible.

<image>Panel A: Cross-sectional diagram of fetal circulation showing patent ductus arteriosus, foramen ovale, and direction of blood flow with labels indicating sites of shunting. Panel B: Comparison diagram showing fetal versus neonatal circulation with arrows indicating changed direction of flow and closure of fetal shunts after birth. Panel C: Infrared thermal image of newborn showing heat loss patterns with color-coded temperature zones highlighting head and extremities as sites of greatest heat loss. Panel D: Illustration of brown adipose tissue distribution in newborn showing locations in neck, interscapular region, and surrounding kidneys and adrenal glands.</image>

II. Newborn Assessment

The APGAR score provides a rapid, standardized method for assessing newborn condition at one and five minutes after birth, evaluating five parameters each scored from zero to two points. Appearance assesses skin color, with two points for completely pink, one point for acrocyanosis with pink trunk, and zero points for generalized cyanosis or pallor. Pulse is assessed at the umbilical cord or by auscultation, with two points for heart rate above 100 beats per minute, one point for heart rate below 100, and zero points for absent heart rate. Grimace evaluates reflex irritability in response to stimulation, Activity assesses muscle tone, and Respirations evaluates breathing effort and cry.

The APGAR score serves primarily as a communication tool and does not predict long-term neurological outcomes when used in isolation. A low one-minute score often improves with appropriate resuscitation, while the five-minute score provides better prognostic information when combined with other clinical findings. Scores of seven to ten are considered normal, four to six indicate moderate depression requiring intervention, and scores of zero to three indicate severe depression requiring aggressive resuscitation. Ten-minute scores may be recorded for infants requiring ongoing resuscitation, with persistently low scores having greater prognostic significance for short-term outcomes.

Vital sign assessment in the newborn period requires knowledge of age-appropriate normal ranges that differ significantly from older children and adults. Normal heart rate ranges from 120 to 160 beats per minute in quiet, awake newborns, though rates may be higher during crying and lower during sleep. Respiratory rate normally ranges from 30 to 60 breaths per minute, with periodic breathing characterized by brief pauses of less than 20 seconds being a normal variant. Temperature should be maintained between 36.5 and 37.5 degrees Celsius, with both hypothermia and hyperthermia requiring investigation and intervention. Blood pressure is not routinely measured in healthy term newborns but averages 60 to 80 systolic and 40 to 50 diastolic millimeters of mercury.

Anthropometric measurements establish baseline growth parameters and help identify potential problems requiring further evaluation. Average term birth weight is approximately 3.5 kilograms, with normal range extending from 2.5 to 4.0 kilograms, though variation exists based on gestational age, sex, and ethnicity. Birth length averages 50 centimeters with normal range of 48 to 52 centimeters, and head circumference averages 35 centimeters with normal range of 33 to 37 centimeters. The relationship between measurements, particularly head circumference approximately 2 centimeters larger than chest circumference, provides additional information about proportionality. Gestational age assessment using the Ballard score, which evaluates physical and neuromuscular maturity, allows classification as small, appropriate, or large for gestational age.

<image>Panel A: APGAR scoring chart displayed as visual reference card showing all five parameters with corresponding zero, one, and two point criteria clearly labeled. Panel B: Healthcare provider assessing pulse at umbilical cord stump while simultaneously observing respiratory effort and color in newborn on warming table. Panel C: Proper technique for measuring newborn length using infantometer with infant positioned supine, head against headboard, and legs fully extended. Panel D: Digital scale displaying newborn weight in grams with infant positioned securely on scale tray in delivery room setting.</image>

III. Newborn Physical Examination

The systematic newborn examination begins with general observation of position, activity, and cry before proceeding to detailed evaluation of each body system. Normal newborn position is flexed with symmetric posture, and spontaneous movements should be symmetric and smooth without jitteriness or seizure activity. The quality of the cry provides important information, with a strong, vigorous cry being reassuring while a weak, high-pitched, or absent cry warrants further evaluation. Skin color should be pink centrally, though acrocyanosis of the hands and feet is normal during the first 24 to 48 hours. Assessment for dysmorphic features or external malformations begins with careful observation before handling the infant.

Head examination includes assessment of shape, fontanelles, and sutures, with recognition of common benign findings and potentially concerning abnormalities. Caput succedaneum, a soft tissue edema that crosses suture lines, results from pressure during labor and resolves within days. Cephalohematoma, a subperiosteal hemorrhage limited by suture lines to a single cranial bone, develops in the first day and resolves over weeks, occasionally causing hyperbilirubinemia as blood is resorbed. The anterior fontanelle should be soft and flat with normal range of 1 to 4 centimeters, while the posterior fontanelle is smaller and may be barely palpable or closed. Sutures may be slightly overlapping at birth but should not be fused, as craniosynostosis requires surgical intervention.

Face and neck examination focuses on eye, ear, nose, and mouth assessment along with evaluation for masses or structural abnormalities. The red reflex examination using an ophthalmoscope detects cataracts, retinoblastoma, and other abnormalities that may impair vision if not treated early. Ear position should be evaluated, with low-set ears defined as the helix meeting the scalp below an imaginary line drawn from the lateral canthus perpendicular to the face. Preauricular pits and tags may be isolated findings or associated with hearing loss, renal anomalies, or genetic syndromes. Patency of the nares can be assessed by holding a cold mirror beneath each nostril or by gently passing a catheter, and the mouth should be examined for cleft palate, natal teeth, and Epstein pearls.

Cardiovascular examination includes auscultation, pulse assessment, and evaluation for signs of congenital heart disease. Heart murmurs are common in the first 24 hours of life, often reflecting transitional circulation, but persistent murmurs require investigation. Femoral pulses must be assessed bilaterally, as weak or absent femoral pulses suggest coarctation of the aorta, a potentially life-threatening condition that may present after ductus arteriosus closure. The precordium should be assessed for heave or thrill, and the point of maximal impulse is normally at the fourth intercostal space left of the sternum. Central cyanosis, unlike acrocyanosis, is always abnormal and requires immediate evaluation for cardiac or respiratory causes.

<image>Panel A: Comparison photographs showing caput succedaneum as diffuse scalp swelling crossing suture lines versus cephalohematoma as localized swelling limited to single cranial bone. Panel B: Direct ophthalmoscope technique for eliciting red reflex in newborn with examiner viewing both eyes simultaneously for comparison and detecting asymmetry. Panel C: Anatomical diagram showing ear position assessment with reference line from lateral canthus, demonstrating normal position versus low-set ears. Panel D: Examiner palpating femoral pulses bilaterally in newborn with proper hand positioning in inguinal creases.</image>

IV. Newborn Examination Continued

Respiratory examination assesses work of breathing and auscultates for symmetry and adventitious sounds indicating potential pathology. Normal newborn breathing is predominantly diaphragmatic, and the chest should expand symmetrically with each breath. Signs of respiratory distress including tachypnea, grunting, nasal flaring, and retractions require immediate evaluation for underlying causes. Breath sounds should be equal bilaterally, with asymmetry suggesting pneumothorax, congenital diaphragmatic hernia, or other structural abnormalities. Transient tachypnea of the newborn, resulting from delayed clearance of fetal lung fluid, commonly occurs in term infants delivered by cesarean section and typically resolves within 24 to 72 hours.

Abdominal examination includes inspection of the umbilical cord, palpation for organomegaly, and assessment for masses or distension. The umbilical cord normally contains two arteries and one vein, with a single umbilical artery present in approximately one percent of newborns and potentially associated with renal or other anomalies. The liver edge is normally palpable 1 to 2 centimeters below the right costal margin, and the spleen tip may be palpable in some normal newborns. Kidneys may be palpable through bimanual examination, particularly on the left side. Abdominal distension may indicate intestinal obstruction, and absence of bowel sounds or bilious vomiting requires urgent surgical evaluation.

Genitourinary examination includes assessment of external genitalia and confirmation of urethral opening position in males. In male infants, both testes should be palpable in the scrotum, and the urethral meatus should be at the tip of the glans. Hypospadias, with the meatus located on the ventral surface of the penis, occurs in approximately 1 in 300 male births and is a contraindication to circumcision until urological consultation. Hydroceles, which transilluminate and represent fluid around the testis, are common and usually resolve spontaneously. In female infants, maternal hormone exposure may cause vaginal discharge or even pseudomenses, which is normal. Ambiguous genitalia requires urgent evaluation to exclude congenital adrenal hyperplasia, which may cause life-threatening salt-wasting crisis.

Musculoskeletal examination focuses on spine evaluation, hip stability, extremity assessment, and clavicle palpation. The spine should be examined for sacral dimples, hair tufts, or skin abnormalities that might indicate underlying spinal dysraphism. Hip examination using Ortolani and Barlow maneuvers screens for developmental dysplasia of the hip, with risk factors including breech presentation, family history, and female sex. The Ortolani test attempts to reduce a dislocated hip, while the Barlow test attempts to dislocate a reducible hip. Clavicle fracture, the most common birth injury, may be detected by palpation of crepitus or asymmetric movement, though many heal without specific treatment.

<image>Panel A: Illustration of umbilical cord cross-section showing normal two arteries and one vein configuration with labeled structures and surrounding Wharton's jelly. Panel B: Step-by-step demonstration of Ortolani maneuver technique showing infant positioning, hand placement, and hip abduction with gentle anterior pressure on greater trochanter. Panel C: Barlow maneuver demonstration showing adduction with gentle posterior pressure to assess hip stability and detect subluxatable or dislocatable hip. Panel D: Newborn spine examination technique with infant in prone position, examiner inspecting lumbosacral area for dimples, tufts, or skin abnormalities.</image>

V. Newborn Screening

Universal newborn screening represents one of the most successful public health initiatives, enabling early detection and treatment of conditions that cause significant morbidity if undiagnosed. The Recommended Uniform Screening Panel includes conditions meeting criteria for early detection benefit, reliable testing availability, and effective treatment options. Metabolic screening uses dried blood spots collected by heel stick at 24 to 48 hours of life, with some states recommending repeat screening at one to two weeks of age. Early discharge before 24 hours may result in false-negative screening for some conditions, necessitating repeat testing.

The metabolic screen evaluates for amino acid disorders, organic acidemias, fatty acid oxidation defects, endocrine disorders, hemoglobinopathies, and other conditions using tandem mass spectrometry and other methods. Phenylketonuria, the first condition added to newborn screening panels, causes intellectual disability if untreated but has normal development with early dietary restriction of phenylalanine. Congenital hypothyroidism, occurring in approximately 1 in 3,000 newborns, requires immediate thyroid hormone replacement to prevent cognitive impairment. Congenital adrenal hyperplasia screening detects elevated 17-hydroxyprogesterone, identifying infants at risk for salt-wasting crisis. Hemoglobinopathy screening identifies sickle cell disease, thalassemia, and other hemoglobin variants requiring early intervention.

Critical congenital heart disease screening using pulse oximetry has been added to recommended newborn screening to detect cyanotic heart defects before discharge. Screening is performed after 24 hours of age to reduce false positives from transitional circulation, measuring oxygen saturation in the right hand (preductal) and either foot (postductal). A passing screen requires oxygen saturation of 95 percent or greater in both locations with a difference of 3 percent or less between sites. Failed screening requires echocardiography to evaluate for structural heart disease. This screening detects lesions including hypoplastic left heart syndrome, pulmonary atresia, tetralogy of Fallot, total anomalous pulmonary venous return, transposition of the great arteries, tricuspid atresia, and truncus arteriosus.

Hearing screening is performed before hospital discharge using otoacoustic emissions or auditory brainstem response testing to detect congenital hearing loss affecting approximately 1 to 3 per 1,000 newborns. Otoacoustic emissions measure sounds generated by outer hair cell activity in response to acoustic stimuli, while auditory brainstem response measures electrical activity in response to sound. Failed screening requires rescreening and, if persistently abnormal, referral to audiology for diagnostic evaluation by three months of age. Risk factors for hearing loss including NICU admission, family history, and congenital infections warrant close follow-up even with normal newborn screening. Early identification enables intervention with hearing aids or cochlear implants during critical periods of language development.

<image>Panel A: Healthcare provider performing heel stick blood collection for newborn metabolic screening with proper technique and filter paper card for sample collection. Panel B: Pulse oximetry screening setup showing simultaneous preductal (right hand) and postductal (foot) measurements with normal values displayed. Panel C: Otoacoustic emissions testing with probe positioned in newborn ear canal and screening device showing waveform display indicating normal response. Panel D: Flowchart showing newborn screening process from specimen collection through result notification, positive screen follow-up, and confirmatory testing pathways.</image>

VI. Neonatal Jaundice

Neonatal jaundice results from accumulation of bilirubin, the breakdown product of heme, and affects approximately 60 percent of term newborns and 80 percent of preterm newborns to some degree. Bilirubin metabolism in newborns is characterized by increased production due to higher red blood cell turnover, immature hepatic conjugation, and increased enterohepatic circulation. Unconjugated bilirubin is lipid-soluble and can cross the blood-brain barrier, potentially causing acute bilirubin encephalopathy and permanent neurological damage known as kernicterus. Conjugated bilirubin is water-soluble and excreted in bile, with elevated direct bilirubin always being pathologic and warranting investigation for cholestasis.

Physiologic jaundice represents the normal pattern of hyperbilirubinemia in healthy term newborns, typically appearing after 24 hours of life and peaking between days three and five. Total serum bilirubin rarely exceeds 12 to 15 milligrams per deciliter in physiologic jaundice, and levels decline spontaneously as hepatic conjugation matures. In contrast, pathologic jaundice is characterized by appearance within the first 24 hours, total bilirubin rising faster than 5 milligrams per deciliter per day, peak levels exceeding age-specific thresholds, or persistence beyond two weeks in term infants. Jaundice appearing in the first 24 hours is always pathologic and requires immediate investigation for hemolysis or other serious causes.

Risk factors for severe hyperbilirubinemia include hemolytic disease, glucose-6-phosphate dehydrogenase deficiency, prematurity, exclusive breastfeeding with weight loss, cephalohematoma, Asian ethnicity, and previous sibling requiring phototherapy. The Bhutani nomogram plots total serum bilirubin against hours of life to stratify risk and guide follow-up and treatment decisions. Hour-specific bilirubin levels in the high-risk zone warrant closer monitoring and earlier intervention, while levels in the low-risk zone allow more lenient follow-up. Predischarge risk assessment combining clinical risk factors with bilirubin zone determination helps ensure appropriate post-discharge follow-up timing.

Evaluation of jaundice includes measurement of total and direct bilirubin, blood type and direct Coombs test to evaluate for hemolytic disease, and complete blood count with reticulocyte count if hemolysis is suspected. Direct bilirubin greater than 1 milligram per deciliter or greater than 20 percent of total bilirubin indicates cholestasis, requiring evaluation for biliary atresia, infections, metabolic disorders, or other causes. ABO incompatibility, occurring when a type O mother has an infant with type A or B blood, is the most common cause of immune-mediated hemolysis. Rh incompatibility, though less common due to RhoGAM prophylaxis, can cause severe hemolysis requiring intrauterine or postnatal transfusion.

<image>Panel A: Bilirubin metabolism diagram showing heme breakdown to unconjugated bilirubin, hepatic conjugation, and excretion pathway with labeled enzyme systems. Panel B: Bhutani nomogram graph with hour-specific bilirubin zones labeled as low-risk, intermediate-risk, and high-risk with plotted example patient trajectories. Panel C: Coombs test interpretation diagram showing direct and indirect antiglobulin test principles for detecting antibody-coated red blood cells. Panel D: Clinical comparison photographs showing normal newborn skin color, mild jaundice visible in sclera and face, and more significant jaundice extending to trunk and extremities.</image>

VII. Feeding

Breastfeeding provides optimal nutrition for newborns and infants, offering immunological, developmental, and bonding benefits that extend to both infant and mother. Breast milk contains immunoglobulins, particularly secretory IgA, as well as lactoferrin, lysozyme, and other antimicrobial factors that protect against infections. The composition of breast milk changes over time, with colostrum in the first days being high in protein and immunoglobulins, transitioning to mature milk by approximately two weeks. The American Academy of Pediatrics recommends exclusive breastfeeding for the first six months of life, continued with complementary foods through at least twelve months and beyond as mutually desired.

Successful breastfeeding initiation requires early skin-to-skin contact, rooming-in, and support for proper positioning and latch in the first hours after delivery. Newborns should feed 8 to 12 times per day in the first weeks, with feeding cues including rooting, hand-to-mouth movements, and increasing alertness preceding crying, which is a late hunger cue. Proper latch involves the infant taking both the nipple and a large portion of the areola, with lips flanged outward and audible swallowing. Signs of adequate intake include 6 or more wet diapers and 3 or more stools per day by day four, with return to birth weight by ten to fourteen days of life.

Common breastfeeding problems include insufficient milk supply, painful latch, engorgement, and mastitis, all of which benefit from lactation consultant support. Weight loss up to 7 percent of birth weight is considered acceptable in the first week, but greater losses warrant evaluation and possible supplementation. Breastfeeding jaundice occurs early due to inadequate intake and resulting dehydration, while breast milk jaundice is a later, prolonged unconjugated hyperbilirubinemia that resolves with continued breastfeeding. Mastitis presents with breast erythema, fever, and tenderness, requiring antibiotic treatment but not interruption of breastfeeding, which actually aids resolution by draining the affected breast.

Formula feeding is appropriate when breastfeeding is contraindicated, unsuccessful despite support, or not desired by the mother. Standard formulas are cow's milk-based and provide appropriate nutrition for most infants, with soy formulas indicated for galactosemia and sometimes chosen for cultural or preference reasons. Extensively hydrolyzed formulas are indicated for cow's milk protein allergy, while amino acid-based formulas are reserved for infants who do not tolerate hydrolyzed formulas. Formula preparation requires attention to concentration, as both over-dilution causing insufficient nutrition and under-dilution causing hypernatremia can be dangerous. Formula-fed infants typically consume 1 to 2 ounces every 2 to 3 hours initially, increasing to 3 to 4 ounces per feeding by one month of age.

<image>Panel A: Proper breastfeeding latch demonstration showing infant positioned with wide mouth gape, flanged lips, and areola visible above the lip with minimal areola visible below. Panel B: Cross-sectional diagram showing milk ejection reflex pathway from nipple stimulation through hypothalamus, posterior pituitary, and oxytocin release causing myoepithelial cell contraction. Panel C: Formula preparation diagram showing proper measurement technique for powder formula with level scoop and appropriate water ratio. Panel D: Growth chart comparison showing acceptable weight loss trajectory in first week with recovery to birth weight by day ten to fourteen.</image>

VIII. Common Newborn Findings

Benign skin findings are extremely common in newborns and recognizing these normal variants prevents unnecessary parental anxiety and workup. Erythema toxicum neonatorum presents as erythematous macules with central yellow or white pustules, appears in the first days of life, and resolves spontaneously. The pustules contain eosinophils on Wright stain, distinguishing this benign condition from bacterial infection. Milia are small white papules caused by retention of keratin within pilosebaceous units, commonly appearing on the nose and face and resolving without treatment. Miliaria, or heat rash, results from blocked sweat ducts and presents as small vesicles in areas of occlusion, prevented by avoiding overheating.

Benign vascular birthmarks include salmon patches and infantile hemangiomas, which have different natural histories and management implications. Salmon patches, also called nevus simplex, stork bites, or angel kisses, are flat, pink vascular malformations commonly located on the nape, eyelids, and glabella that fade over time in most cases. Infantile hemangiomas are not present at birth but appear in the first few weeks of life, proliferating during the first year before gradually involuting over years. Most hemangiomas require only observation, but those affecting vision, airway, or vital structures may require beta-blocker therapy or other intervention. Port-wine stains are present at birth, do not fade, and may be associated with Sturge-Weber syndrome when involving the ophthalmic trigeminal distribution.

Normal respiratory and gastrointestinal patterns in newborns may concern parents unfamiliar with expected variations. Periodic breathing, characterized by brief pauses in respiration lasting less than 20 seconds without color change or bradycardia, is normal in newborns. This pattern differs from apnea, which involves pauses exceeding 20 seconds or associated with cyanosis, pallor, or bradycardia and requires evaluation. Meconium passage should occur within the first 24 to 48 hours of life, transitioning to yellow seedy stools in breastfed infants by day four to five. The umbilical cord typically separates at one to two weeks of age, with normal desiccation progressing from moist to dry before detachment.

Maternal hormone effects cause several transient findings in newborns that resolve without intervention. Breast engorgement may occur in newborns of either sex due to maternal estrogen exposure, occasionally with small amounts of milk production termed "witch's milk," and resolves over weeks. Vaginal discharge in female newborns may be white and mucoid or even blood-tinged due to maternal estrogen withdrawal, representing a normal finding that does not require evaluation. Pseudostrabismus, the appearance of crossed eyes due to a flat nasal bridge and prominent epicanthal folds, is common and must be distinguished from true strabismus by demonstrating symmetric corneal light reflexes. Sacral dimples located above the gluteal cleft and clearly visualized at the base are benign, while midline dimples above the cleft or associated with other abnormalities warrant imaging to exclude spinal dysraphism.

<image>Panel A: Clinical photograph of erythema toxicum neonatorum showing scattered erythematous macules with central pustules on newborn trunk and extremities. Panel B: Infantile hemangioma progression series showing minimal initial finding at two weeks, peak proliferation at six months, and involution by three years. Panel C: Normal umbilical cord separation sequence showing moist cord at birth, drying by one week, and clean healed umbilicus after separation. Panel D: Comparison of pseudostrabismus with symmetric corneal light reflexes versus true esotropia with asymmetric light reflexes.</image>

IX. Immunizations and Vitamin K

The hepatitis B vaccine is the only immunization routinely administered in the newborn period, providing protection against a virus that causes chronic infection in 90 percent of perinatally infected infants. The first dose is recommended within 24 hours of birth for all medically stable infants weighing 2,000 grams or more, regardless of maternal hepatitis B surface antigen status. For infants born to mothers who are hepatitis B surface antigen positive, hepatitis B immune globulin should be administered within 12 hours of birth along with the vaccine to provide passive and active immunization. Infants born to mothers with unknown status should receive the vaccine within 12 hours while maternal testing is completed, with immune globulin given if the mother tests positive.

Vitamin K administration prevents hemorrhagic disease of the newborn, which results from deficiency of vitamin K-dependent clotting factors in the first weeks of life. Newborns have limited vitamin K stores due to poor placental transfer, sterile gut lacking vitamin K-producing bacteria, and low vitamin K content of breast milk. A single intramuscular injection of 1 milligram phytonadione at birth effectively prevents all forms of vitamin K deficiency bleeding, including early, classic, and late presentations. Late vitamin K deficiency bleeding, occurring at two to twelve weeks of age, most commonly presents with intracranial hemorrhage and is almost exclusively seen in breastfed infants who did not receive prophylaxis.

Parental refusal of vitamin K requires documentation of informed refusal and discussion of the consequences, including risk of life-threatening bleeding. Oral vitamin K has been used in some countries but requires multiple doses, has lower efficacy than intramuscular administration, and has been associated with cases of late bleeding despite protocol completion. Healthcare providers should address parental concerns with factual information while respecting autonomy, documenting the discussion and refusal in the medical record. Follow-up should include repeated counseling at subsequent visits, as some parents change their decision after further consideration.

Erythromycin ophthalmic ointment is administered to all newborns to prevent ophthalmia neonatorum caused by Neisseria gonorrhoeae acquired during passage through an infected birth canal. This prophylaxis has dramatically reduced the incidence of gonococcal ophthalmia, which can progress rapidly to corneal ulceration and blindness if untreated. Erythromycin is less effective against Chlamydia trachomatis, which may cause conjunctivitis at one to two weeks of age despite prophylaxis, requiring systemic treatment to prevent chlamydial pneumonia. Silver nitrate, historically used for prophylaxis, is no longer recommended due to chemical conjunctivitis and lack of chlamydial coverage.

<image>Panel A: Healthcare provider administering intramuscular vitamin K injection to newborn's anterolateral thigh with proper technique and positioning. Panel B: Hepatitis B immunization schedule flowchart showing decision pathway based on maternal HBsAg status and infant birth weight. Panel C: Erythromycin ophthalmic ointment application technique with ribbon of ointment applied to lower conjunctival sac from inner to outer canthus. Panel D: Timeline diagram showing vitamin K deficiency bleeding types with early (first 24 hours), classic (days 2-7), and late (weeks 2-12) presentations and associated clinical features.</image>

X. Discharge Counseling

Safe sleep education is critical for preventing sudden infant death syndrome, the leading cause of death in infants between one month and one year of age in developed countries. The supine sleep position has dramatically reduced SIDS rates since the "Back to Sleep" campaign began in 1994, and no other sleep position is recommended. The sleep surface should be firm and flat, such as a safety-approved crib, bassinet, or play yard, without soft bedding, pillows, or loose blankets. Room-sharing without bed-sharing is recommended for the first six to twelve months, as bed-sharing increases SIDS risk and risk of suffocation, entrapment, and strangulation.

Car seat safety education ensures proper restraint use from the first ride home from the hospital. All infants should ride in rear-facing car seats until at least age two or until they reach the maximum height or weight limit of their seat. The car seat should be installed in the rear seat, preferably in the center position, and secured tightly so that it moves less than one inch side-to-side or front-to-back at the belt path. The harness should be snug enough that you cannot pinch excess webbing at the shoulder, with the chest clip positioned at armpit level. Many hospitals and communities offer car seat inspection stations staffed by certified technicians who can verify proper installation.

Warning signs requiring medical attention should be reviewed with parents before discharge to ensure appropriate care-seeking behavior. Fever in an infant under 28 days of age, defined as rectal temperature of 38 degrees Celsius (100.4 degrees Fahrenheit) or higher, requires urgent evaluation including full sepsis workup and empiric antibiotics. Jaundice progressing rapidly, appearing in the first 24 hours, or persisting beyond two weeks warrants medical evaluation. Other concerning signs include poor feeding, lethargy beyond normal sleepiness, respiratory distress, persistent vomiting especially if bilious, and color changes including pallor, cyanosis, or gray appearance.

Follow-up timing depends on risk factors identified before discharge, with higher-risk infants requiring earlier assessment. Most healthy term newborns should have follow-up within 48 to 72 hours of discharge to assess feeding, weight, and jaundice. Infants discharged before 48 hours, those with risk factors for hyperbilirubinemia, or those with feeding difficulties may require follow-up within 24 hours. The follow-up visit should include weight measurement, jaundice assessment (with bilirubin measurement if indicated), feeding evaluation, and assessment of general well-being. Establishing care with a primary care provider before discharge facilitates appropriate follow-up scheduling and continuity of care.

<image>Panel A: Safe sleep environment demonstration showing bare crib with fitted sheet only, supine infant positioning, and room temperature thermostat display. Panel B: Rear-facing car seat installation diagram showing proper angle, tethering points, and harness positioning with measurements for appropriate slack. Panel C: Infant thermometer placement diagram showing proper rectal temperature measurement technique with depth markings and normal versus fever ranges. Panel D: Follow-up decision algorithm showing risk stratification for determining appropriate timing of post-discharge visit based on age at discharge and clinical risk factors.</image>

Summary

• Newborn transition: first breath clears fluid; PVR drops, ductus closes
• APGAR: 1 and 5 minutes; assesses transition, not long-term prognosis
• Physical exam: red reflex, hip stability, femoral pulses, heart murmur
• Newborn screening: metabolic panel 24-48 hours, hearing, CCHD pulse ox
• Jaundice: physiologic peaks day 3-5; early (<24 hours) always pathologic
• Bhutani nomogram: risk stratifies based on bilirubin and hours of life
• Breastfeeding: exclusive 6 months; 8-12 feeds/day; assess output and weight
• Vitamin K: 1 mg IM prevents hemorrhagic disease of newborn
• Hepatitis B: first dose at birth; HBIG if mother HBsAg+
• Safe sleep: supine, firm surface, no soft bedding

Key Terms

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