Infants often spit up may be due to improper feeding, congenital pyloric stenosis, gastrointestinal dysfunction and other reasons, need to be specifically analyzed. 1. Improper feeding: If the intake of milk is too much, or the feeding speed is too fast, it may lead to high intragastric pressure and the reflux of food in the stomach leading to spitting up. 2. Congenital pyloric stenosis: some infants may have some congenital diseases, such as congenital pyloric stenosis, which leads to gastric contents not being able to go down, resulting in increased intragastric pressure, leading to spitting up. 3. Gastrointestinal dysfunction: Some infants may suffer from allergies or other causes that lead to gastrointestinal dysfunction, resulting in indigestion in the stomach and increased intragastric pressure, which leads to frequent spitting up. Babies often spit up may also be caused by other reasons, if the persistence can not be improved, you need to consult a doctor as soon as possible to check the cause, and to take targeted treatment, to avoid affecting the normal growth and development of the baby.