Clinical Reasoning: A 2-Day-Old Boy With Sudden Cardiac Arrest and Encephalopathy.

A 36-week, 5-day-old boy was born through uncomplicated vaginal delivery to a healthy, 36-year-old G7P4 mother. His resuscitation included tactile warmth, drying, and stimulation, and his Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. He was small for gestational age with a birth weight of 2100 g (0.16 percentile). His course was unremarkable with normal behavior and breastfeeding for approximately 40 hours of life.