When vomiting is frequent, it is best to fast the child for 3-4 hours and allow the child to fast. During the fasting period, the child can drink a small amount of warm water or oral rehydration saline, and the vomiting will be significantly relieved after 3-4 hours of fasting. If the child vomits violently, vomits yellow bile-like material or vomits with coffee-like material, it is best to go to the hospital. If the vomiting is accompanied by diarrhea, abdominal pain or fever, it is most likely caused by a gastrointestinal tract infection, and the child can be tested for stool and blood tests plus C-reactive protein. If you consider bacterial gastroenteritis, give your child anti-inflammatory medication and take montelukast and probiotics to regulate the intestinal tract.