Vomiting and diarrhea in children is often seen in acute gastroenteritis. Whether or not you can drink water depends on the degree of vomiting; if the vomiting is mild, you can drink water; if the vomiting is severe, you need to fast for a short period of time, and it is not recommended to drink water. Acute gastroenteritis is a common disease of the gastrointestinal tract in pediatrics, and may have a history of unclean eating and drinking. Clinical symptoms of vomiting, diarrhea, or fever may occur, and in severe cases, signs of dehydration may be present, such as sunken eye sockets and dry skin and mucous membranes. Whether such children can continue to drink water is related to the degree of their vomiting. If the vomiting is not serious, they can drink water appropriately, which can increase water intake and avoid dehydration, but they need to pay attention to their diets, eat easy-to-digest foods, and avoid greasy foods. For children with severe vomiting, such as those who vomit when they drink water, continuing to drink water may aggravate the vomiting phenomenon. For such children, it is recommended to fast for a short period of time, avoiding water and food intake, and at the same time, intravenous fluid supplementation should be provided to avoid the occurrence of insufficient intake. Consultation with a specialist is recommended.