The treatment of vomiting and diarrhea in babies 3 years old is mainly medication, such as gastritis can be used cimetidine and other drugs, inflammatory bowel disease can be used LiuZiSulphadiazine and so on. 1. gastritis: baby 3 years old vomiting diarrhea may be caused by acute and chronic gastritis, mostly due to bacterial infections, such as Helicobacter pylori and other reasons, its main manifestations are abdominal pain, nausea, vomiting, diarrhea and so on. The main symptoms are abdominal pain, nausea, vomiting and diarrhea, etc. The main treatment is medication, which can use gastric mucosal protective agents such as aluminum thioglycollate and acid-suppressing drugs such as cimetidine. 2. Inflammatory bowel disease: inflammation of the gastrointestinal tract due to unknown causes, including ulcerative colitis, Crohn’s disease and so on. Its main manifestations include diarrhea, constipation, vomiting and so on. Treatment includes nutritional support as well as medication, which may include aminosalicylic acid drugs such as sulfasalazine, glucocorticoids such as prednisone, and other medications. Vomiting and diarrhea in three year old babies should be treated by a doctor in a timely manner and should not be self-medicated.