Children always spit up milk may be related to physiological factors, indigestion and other reasons. 1. Physiological factors: the special structure of the child’s digestive system (the stomach is horizontal, the cardia sphincter is poorly developed, and the lower esophageal sphincter is shorter) and the imperfect function of the digestive system (poor gastrointestinal dynamics, low secretion of gastric acid and pepsin) will make the child spit up after eating milk. 2. Indigestion: the child’s stomach capacity is small, should be based on weight, the amount of milk to complete the situation, according to the needs of breastfeeding. If the amount of milk is too much at one time, the interval between feedings is short, or the mother eats more fat and protein, which can cause the child to have indigestion and spit up. Children spit up all the time may have other reasons, a small amount of spit up is a normal phenomenon, pay attention to spit up when the head to one side, to avoid choking and coughing. If the child spits up a lot of milk, you need to go to the hospital immediately, complete the relevant examination to clarify the cause of the disease, give targeted treatment.