History and physical examination During pregnancy,<unk>  is associated with increased amniotic fluid in the uterus, which is called polyhydramnios. This increase in amniotic fluid is caused by the inability of the fetus to swallow the amniotic fluid and absorb it in their digestive tract. After birth,<unk>  may cause abdominal distension, especially of the upper abdomen. Bilious or non-bilious vomiting, depending on the position of the atresia in relation to the Ampulla of Vater, commonly occurs within the first<unk> y of life. Associated conditions Approximately 20–40 percent of all infants with<unk>  have Down syndrome and 50% have a congenital cardiac anomaly. Approximately 8% of infants with Down syndrome have<unk> .
Duodenal atresia
Annular pancreas
Intestinal atresia
Gastric atresia
Choanal atresia
Familial multiple intestinal atresia
Gastroschisis
Situs inversus