Neonatology and Perinatal Medicine
Core concepts
Master the transition at birth: lung fluid clearance, surfactant, and the first breath; understand why delayed cord clamping and thermal care matter. Know the Apgar score is a tool for resuscitation response, not a predictor of outcome, and that NRP-style airway/breathing/circulation steps follow a defined sequence. Understand neonatal jaundice physiology: unconjugated hyperbilirubinemia from immature conjugation, risk factors (prematurity, hemolysis, cephalohematoma, breastfeeding), and the difference between physiologic and pathologic jaundice (onset <24 h, rapid rise, high levels, prolonged). Know sepsis risk factors (maternal fever, prolonged rupture of membranes, group B Streptococcus), hypoglycemia thresholds, and the presentation of necrotizing enterocolitis (feeding intolerance, bloody stools, abdominal distension, pneumatosis). Understand respiratory distress syndrome (surfactant deficiency, ground-glass chest, reticulogranular pattern) versus transient tachypnea of the newborn.
Traps
- Jaundice in the first 24 hours is always pathologic - think hemolysis or infection.
- Apgar at 5 minutes does not predict cerebral palsy; avoid over-interpreting it.
- Confusing physiologic jaundice timing (after 24 h, peaks day 3–5) with pathologic patterns.
- Missing hypoglycemia in the infant of a diabetic mother or small-for-gestational-age infant.
- Forgetting that NEC is a medical/surgical emergency and that abdominal X-ray pneumatosis is diagnostic.
Worked example / rule of thumb
For a term infant with jaundice at 36 hours, check total and direct bilirubin, blood type and Coombs, hematocrit, and reticulocyte count. Plot on a hour-specific nomogram; treatment thresholds depend on age in hours and risk factors. Rule of thumb: jaundice before 24 h, direct hyperbilirubinemia, or jaundice beyond 2 weeks is never "just physiologic" - investigate.