Soon after birth, especially in the first few months, children often spit up milk, sometimes one or two hours after the milk will spit out like tofu-like milk, which is due to the action of stomach acid, milk cohesion into small pieces. First of all, the physiological structure of the baby’s stomach: the capacity of the newborn’s stomach is only as big as a ping pong ball, to about five months, such as a small orange, to one year old, such as the size of a fist, of course, different weight size will vary. Then introduce the location of the stomach, baby’s stomach is horizontal, such as a bottle of water, across the easy to overflow. The structure of the stomach, the entrance is called the cardia, relatively loose, the exit connected to the intestine is called the pylorus, relatively tight, some children here the sphincter is thicker. Therefore, when the body position changes, the liquid in the stomach is easy to come out. How to prevent it? First of all, the amount of milk fed should not be declared too much. Babies are born with a sense of hunger and fullness when they eat milk, so if they eat enough, they will push the nipple out, so don’t give it to them again, and when they are hungry, they should eat immediately. Feeding should be on demand, not mechanically timed and rationed. Pay attention to the position: when feeding the baby, you can hold the baby diagonally, at 45 degrees, and keep the same position after feeding, after twenty minutes, most of the gas flow will enter the small intestine and will not be vomited out. When sleeping, the head of the crib can be raised and the child can sleep on the right side, so that the milk will not be choked into the lungs even if it is spit up, preventing suffocation. If the spitting up occurs after two weeks of life, the amount of spitting up at night is more than in the morning, and the baby loses weight, it is necessary to consider whether the baby has congenital pyloric hypertrophy, which needs to be diagnosed in the hospital, or a minor surgery if it is serious. Of course, most infant vomiting is physiological and will gradually improve as the child grows up. There is no need to worry too much. There are individual cases of vomiting with other systemic diseases, such as intracranial edema, hemorrhage, encephalitis, and frequent vomiting after a fall or high fever, which should be taken seriously. Also, inflammation of the gastrointestinal tract, pesticide contaminated food ingestion, some congenital metabolic diseases, deformities, etc. Any vomiting accompanied by growth disorders should be ruled out for the existence of some pathological factors.