There might be the following reasons for newborns vomiting milk: 1. ** Physiological factors **: The newborn's stomach is horizontal, and the stomach capacity is small. The muscular layer of the stomach wall is underdeveloped, and the muscle tension is low. After feeding, or when eating a lot of milk, there will be a situation of milk overflow (spitting milk). 2. ** Pathological factors **: Due to symptoms such as abdominal distension and vomiting of milk caused by diseases such as colds, coughs, epidemic diarrhea, and pneumonias, in addition to vomiting milk, the baby will also have diarrhea, abdominal distension, crying, milk rejection, and mental state changes. In addition, the symptoms of vomiting milk usually began to be obvious at one month of age. It was manifested as vomiting while feeding. After vomiting, the newborn would become thinner and thinner because of hunger, leading to malnutrition. 3. ** Inappropriate feeding method **: For example, the newborn is anxious when feeding milk, or is restless when feeding, resulting in excessive intake of air, vomiting milk, hiccups, etc. To solve the problem of newborns spitting milk, the following solutions could be taken: 1. When feeding, the posture must be correct so that the baby's body has a certain inclination. 2. Don't let the baby breathe in air. 3. After feeding, you can let the baby lie on the shoulder and gently pat the baby's back with the hollow palm to burp. 4. If the baby vomits milk seriously, don't continue to feed it, and don't feed it frequently. Give the baby's small stomach a milk emptying period, usually 2-4 hours. 5. Don't feed the baby when he's too hungry to avoid choking or inhaling air. Don't force feed the baby when he's not hungry at all. 6. For bottle feeding, the size of the hole in the teat should be appropriate, not too big or too small. 7. Don't tease the baby immediately after the milk is finished, so as not to spit out the milk.