Pyloric hypertrophy mainly has the following manifestations: 1, with vomiting as the first symptom, vomiting usually appears about half a month after birth, frequent vomiting, vomiting about 15-20 minutes after each milk, vomiting more, without milk petals, almost close to eat into the original milk. 2, the baby’s physical development is poor, the weight loss is obvious, mostly because of frequent vomiting, malnutrition is caused. 3, in the abdomen, sometimes Olive-sized hard knots will be felt.4. Ultrasound examination of the abdomen can be clear, and when it is clear, surgical treatment is needed.