<unk>  is a condition in which the first part of the small bowel (the duodenum) has not developed properly. It is not open and cannot allow the passage of stomach contents.
Duodenal atresia
Intestinal atresia
Choanal atresia
Situs inversus
Esophageal atresia
Meconium ileus
Intestinal malrotation
Imperforate anus