Children with anal atresia can have the following manifestations: 1. no normal anus in the perineum, i.e., no anus; 2. abdominal distention can occur, which becomes more pronounced with time. If you find that a newborn has not defecated within 24 hours after birth, you should check for anal atresia; 3. vomiting, because you cannot defecate, digestive juices, milk, or even feces can be vomited out of the mouth, mostly yellowish-green, or fecal-colored; 4. urethral fistula, vaginal fistula, perineal fistula, etc., and abnormal fistula with defecation