Final answer:
The most likely medical complication for the infant in this scenario is Duodenal atresia, a congenital condition where the first part of the small intestine is blocked or absent.
Step-by-step explanation:
The most likely medical complication for the infant in this scenario would be C. Duodenal atresia.
Down syndrome (also known as Trisomy 21) is a genetic disorder that results in intellectual disability and physical abnormalities. It is associated with several medical complications, including gastrointestinal abnormalities. Duodenal atresia is a congenital condition where the first part of the small intestine (duodenum) is blocked or absent. This can lead to the infant experiencing vomiting (emesis) shortly after birth.