A 24-day-old infant who was born at term presents at the emergency department with jaundice and feeding intolerance. He had been born to a 24-year-old gravida 3 para 2 woman via elective cesarean section due to placenta previa. Maternal serology test results were negative. Apgar scores were 9 at both 1 and 5 minutes. Infant and mother were discharged from the hospital 4 days after birth.

At 2 weeks of age, the mother noted that the infant’s sclerae were icteric. They missed their first well-baby evaluation appointment. On postnatal day 19, the baby began to have nonbilious emesis with every feeding of 20-kcal formula. Three days later, the mother noted that the baby was sleeping more, and she brought him to the emergency department the next day.

The mother reports that the infant has no history of fever, rash, diarrhea, or medications, and his stools are green pigmented. Physical examination...

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