The common reasons for babies to keep on breastfeeding and vomiting are physiological factors, improper feeding, pathological factors such as hypertrophic pyloric stenosis, etc., which are analyzed as follows: 1. Physiological factors: infants’ stomach is small and horizontal, and the cardia sphincter is not fully developed, if they are fed too much milk at one time and drink milk too quickly, it can cause milk reflux and lead to vomiting, and then they feel hungry again, so they keep on vomiting after feeding. 2. Improper feeding: If you feed your baby in an improper position during the feeding process, feed your baby when he or she cries a lot, or let him or her lie down immediately after feeding, it will make the baby vomit. 3. Hypertrophic pyloric stenosis: It is manifested as milk spillage at first, and then vomiting gradually aggravates in the form of jet. The cause of the baby has been to eat the milk after eating and vomiting may also have other aspects of the pathological reasons, it is recommended to timely to the hospital to carry out relevant examinations, clear cause of the disease and active symptomatic treatment.