1. Imperforate anus is a birth defect where the rectum is not connected to the anus. It requires surgery to create an opening for stool passage. 2. Surgery for high or intermediate cases first creates a temporary colostomy. After months of growth, a more complex procedure connects the rectum to the new anus. 3. Necrotizing enterocolitis is a disease that affects premature infants, causing parts of the intestine to die. It requires stopping feeds, antibiotics, and may necessitate surgery to remove dead sections of bowel.