Spitting up watery liquid in children may be caused by imperfect swallowing function, or it may be caused by other reasons such as intestinal obstruction, acute gastroenteritis, congenital megacolon, and so on. 1. Imperfect swallowing function: if the child’s swallowing muscle group coordination is relatively poor, the oral cavity capacity is relatively small, in the saliva secretion increases, there may be the performance of spitting watery liquid. This is a normal physiological phenomenon and does not require treatment. 2. Intestinal obstruction: Intestinal obstruction may be caused by poor gastrointestinal motility, poisoning, intestinal infections and other reasons. Patients will have abdominal pain, vomiting, abdominal mass and other manifestations. 3. Acute gastroenteritis: acute gastroenteritis is considered to be caused by bacterial infection, viral infection, drug factors and other factors. Patients will have abdominal pain, abdominal pain, nausea and vomiting and other symptoms. At this time the patient will have watery fluid. 4. Other: children with congenital megacolon, reflux esophagitis and other diseases will also have symptoms of vomiting watery fluid. Children vomiting watery fluid, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.