Children spitting up a lot of milk may be physiological factors, pyloric stenosis, meningitis and other causes. 1. Physiological factors: children’s stomach capacity is relatively small, in a horizontal position, coupled with the central development is not yet perfect, so it is easy to spit up. The phenomenon of spitting up will be aggravated if the amount of milk fed at one time is too large, the speed of breastfeeding is too fast, the position is changed too much, and the phenomenon of violent coughing will be aggravated. 2. Pyloric stenosis: also known as congenital hypertrophic pyloric stenosis, is a malformation of the digestive tract caused by pyloric hypertrophy, which is a congenital malformation. Patients may have symptoms such as loss of appetite, dehydration, and in severe cases, abdominal mass and projectile vomiting. 3. Meningitis: It is an acute inflammation of the cerebrospinal membrane caused by bacterial, viral, tuberculosis and other infections. Patients may have headache, fever, irritability, vomiting, etc. In severe cases, convulsions and coma may occur. Children spitting up a lot of milk may also be caused by other reasons, parents are advised to take their children to the regular hospital for consultation, improve the examination and then targeted treatment.