Sudden vomiting in babies is mostly considered to be caused by improper diet, abdominal cold, acute gastroenteritis, gastrointestinal flu, acute intestinal obstruction, intussusception and other reasons, and need to go to the hospital to clarify the causes before treatment. A, physiological factors: baby gastrointestinal function is not perfect, after eating food reflux in the stomach can suddenly vomit, is a normal physiological phenomenon, after eating parents should hold the baby vertically pat, to exclude gas in the stomach. Second, external factors: 1, improper diet: drink too much milk, too fast or eat indigestible food, coupled with the imperfect development of the baby’s digestive system, can easily lead to sudden vomiting, but the general condition is good. Parents are advised to feed their babies with less food and more meals, and pay attention to speed control when feeding; 2. abdominal cold: the baby’s abdomen can be cold due to thin clothing, and vomiting symptoms can occur without special treatment, just pay attention to keep warm. 3, disease factors: 1, acute gastroenteritis: mostly due to eating unclean food leading to bacterial, microbial infection, the baby in addition to sudden vomiting, accompanied by nausea, abdominal pain, diarrhea and other symptoms, if necessary, the use of antibiotic treatment, such as amoxicillin, cefixime; 2, gastrointestinal flu: mainly caused by the coxsackie virus, mostly manifested as vomiting, bloating, abdominal pain, diarrhea and other symptoms. Need to improve blood routine, stool routine, kidney function examination. Under the guidance of the doctor can be given patchouli, four mills soup to relieve symptoms, while actively symptomatic treatment, such as dehydration can be given oral or intravenous rehydration, repeated vomiting can be treated with probiotics; 3, acute intestinal obstruction, intussusception: baby suddenly vomiting, pressure on the abdomen can have a harder mass, need to be alert to the possibility of intestinal obstruction, intussusception. If diagnosed as intestinal obstruction, need to actively investigate the cause of intestinal obstruction, if necessary, can be surgical treatment; if intestinal overlap, can follow medical advice to take non-surgical treatment, such as air enema, barium enema, serious surgical treatment; 4, other: appendicitis, intestinal torsion, central system infection, craniocerebral trauma, craniocerebral tumors and other diseases may lead to baby vomiting, it is recommended to seek timely medical clarification of the cause. It should be noted that if the baby vomits suddenly, it can lead to dehydration, so you can give the baby more warm salt water. If a visit to the doctor suggests a disease, a light diet should be observed during treatment.