Vomiting and diarrhea in a 3-year-old child may be caused by food poisoning, acute gastroenteritis, etc. The treatment includes general therapy, medication (e.g., cephalosporin antibiotics, Bifidobacterium quadruple vivax tablets), enemas, and surgical treatments, etc. The treatment should be chosen according to the patient’s condition. Specific need to follow the doctor’s advice according to the cause and condition to choose. 1. General treatment: avoid eating and drinking, at this time the gastrointestinal tract is in a state of spasm, eating and drinking can lead to aggravation of symptoms; local hot compresses or rubbing the abdomen can help to relieve gastrointestinal spasm. 2. Drug treatment: such as acute enteritis can be considered to give cephalosporin antibiotics, penicillin antibiotics; such as intestinal flora imbalance can be considered bifidobacterium tetrads tablets, lactobacillin tablets and other drugs. 3. Other treatments: such as food poisoning need to consider gastric lavage, diarrhea and other treatments; such as intussusception need to consider gas enema treatment; such as intestinal obstruction need to consider surgical treatment. For the treatment of vomiting and diarrhea in 3-year-old children, it is recommended to give corresponding treatment after consulting the doctor to clarify the cause.