Acute gastroenteritis in 2-year-old babies is mostly caused by improper diet or overly cool or hot weather, and the child may have fever, vomiting, diarrhea and other symptoms. If the baby does not have a fever, vomiting is not frequent, the number of stools is not too many, the state of mind is good, can drink water on its own, there is no urine decreased and other symptoms of dehydration, you can test the stool to exclude bacterial infection, give the child probiotics and digestive drugs to observe, pay attention to insulation, pay attention to diet. Stop fish, meat, eggs, milk, vegetables and fruits, you can give your child some thin rice porridge, rice soup, noodles, drink more water appropriately, and add oral rehydration salt inside. If the baby has fever, temperature over 38 degrees, vomiting more frequently, more frequent stools, less water, less urine, need to fasting water for 4-6 hours, while going to the pediatric internal medicine interview, blood tests, stool routine, need to rehydration treatment better.