One-and-a-half-year-old baby vomiting usually takes into account the following possibilities: first, pay attention to dietary factors, if improper diet, eating too much or food allergies, lactose intolerance can appear vomiting. Secondly, we should pay attention to vomiting caused by lower digestive function due to cold. Third, we should consider the possible infection factor, usually seen in intestinal viral infection or bacterial infection, causing impaired digestive function and vomiting. Fourth, we should pay attention to other disease factors, such as the presence of gastroesophageal reflux, congenital hypertrophic pyloric stenosis, pancreatic orifice relaxation or chronic gastritis, gastric ulcer, duodenitis, reflux gastroesophagitis, etc.