Spitting up is a common occurrence in babies, where food is emptied from the stomach forcefully and in large amounts. So what are the reasons why parents are worried about their babies spitting up? Baby vomiting is divided into physiological and pathological causes. Physiological vomiting usually relieves itself, and if it is pathological vomiting you need to take your baby to the doctor, so parents should distinguish. Physiological vomiting usually occurs before 4 months of age, especially in newborns. Spitting up shows a small amount of milk after eating, or a burp brings out a mouthful of milk, usually not a large amount, and shows overflow or light vomiting. The milk is still in its original state. As soon as they finish eating, they show no painful expression after spitting up, or even more pleasant. Pathological vomiting in babies can occur at any age and with certain diseases. The spitting up of milk is in the form of jets. Usually, the baby spits up all the milk in the stomach and also spits up gastric juices. If it has been a long time between feedings, the baby will spit up lumpy, sour-smelling, semi-digested milk. In addition to vomiting, there are other symptoms of discomfort. In terms of avoiding spitting up, children who take mother’s milk are better at this than children who take bottles, which swallow a lot of air, but not breast milk, because the baby’s mouth and the mother’s nipple form a vacuum and air cannot easily intrude. As for the amount of spit-up, it just looks like a lot, but in fact most of it is gastric juice and the child will not be hungry because of it.