A one-year-old child just after drinking milk on the vomit, may be physiological factors, but also may be acute gastroenteritis, intestinal obstruction and other pathological factors lead to. 1. Physiological factors: the child’s gastrointestinal digestive function is weak, gastric emptying is relatively late, at the same time, the stomach is horizontal, if you eat the milk after a strenuous exercise, or emotionally unstable, crying, there may be the case of vomiting after drinking milk. 2. Acute gastroenteritis: the early manifestation of acute gastroenteritis is vomiting, followed by fever, abdominal pain, diarrhea and other symptoms, which can also lead to a one-year-old child vomiting after drinking milk. 3. Intestinal obstruction: this is one of the common pediatric diseases, usually severe vomiting, can not be relieved, at the same time the child cries seriously, stop defecation. A year-old child vomits after drinking milk, there may be other reasons, it is recommended to consult a doctor in a timely manner, improve the examination, clarify the cause, and treat the cause.