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A 6-day-old, late-preterm male neonate presents to his pediatrician’s office with bilious emesis and is admitted for further evaluation. He was born at 36 weeks and 6 days via spontaneous vaginal delivery to a 23-year-old G4P4 mother with negative serologies, negative antenatal Group B Streptococcus testing, and no significant prenatal events. His stay in the newborn nursery was unremarkable. The neonate is exclusively breastfed, has no history of rectal bleeding, and passed meconium within the first 24 hours. What’s the diagnosis?
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