Why do children spit up milk easily? Children are the darlings of parents, but children sometimes spit up milk, which makes parents very worried. So why do children spit up milk easily? First of all, children\’s gastrointestinal system is not fully developed, and the contraction ability of the gastrointestinal tract is relatively weak, so food is easy to stay in the stomach, causing vomiting. Secondly, when children drink milk, due to uncoordinated swallowing, milk will enter the esophagus, causing reflux and vomiting. In addition, some children may have factors such as hyperacidity or lactose intolerance, which are among the causes of vomiting. how