The baby will spit up every time after feeding, which may be caused by physiological factors such as imperfect development and improper feeding, as well as congenital megacolon and other factors such as acute gastroenteritis. 1. Physiological factors: the baby’s stomach capacity is small, the stomach is horizontal, the pyloric sphincter is developed, the pancreatic sphincter relaxation, will also make the baby will spit up every time after feeding. In addition, the baby vomiting center development and swallowing muscle group development is not perfect, will also lead to spit up after each feeding. These are physiological phenomena and can be left untreated. 2. Congenital megacolon: Congenital megacolon may be caused by heredity and environmental factors. Patients will have symptoms such as abdominal distension, persistent constipation and vomiting. If your baby has congenital megacolon, it will show up as spitting up after every feeding. 3. Other: the baby will spit up every time after feeding is also considered to be acute gastroenteritis, congenital hypertrophic pyloric stenosis and other diseases. The baby will spit up every time after feeding, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.