Babies vomit after eating milk, the following situations are common: first, congenital pyloric hypertrophy or stenosis, vomiting occurs mostly at the age of half a month after birth, every time after eating milk will vomit, the baby’s nutritional status is poor, physical development is backward, yellow and thin, poor weight growth, take the baby to the hospital in a timely manner, do abdominal ultrasound examination, if necessary, surgery. Second, incorrect feeding method, inhalation of too much air during feeding and vomiting, when eating breast milk, pay attention to more sucking containing the areola, to avoid inhaling too much air, after eating milk vertical hold pat back, burping and then lying down. Third, if vomiting is frequent, accompanied by abdominal distension, abdominal pain, irritability, crying and restlessness, go to the hospital in time to avoid possible intestinal obstruction.