3-year-old baby diarrhea, mainly seen in the following two cases: 1, pediatric enteritis, mainly due to unclean diet resulting in bacteria, viruses into the intestinal tract, resulting in damage to the intestinal mucosa, the number of bowel movements increased, abdominal pain, serious cases can be nausea, vomiting. The treatment is to replenish water and electrolytes, such as compound electrolytes, oral solution to avoid dehydration and electrolyte disorders in children. If the intestinal flora is not accompanied by fever, give appropriate anti-infective treatment, such as ceftazidime, ampicillin gum. 2, enteritis, mainly gastrointestinal tract dysfunction, indigestion, intestinal flora dysbiosis, symptoms of watery stool or egg-flower soup-like stool, give rehydration treatment to prevent dehydration and electrolyte disorders, montelukast to protect the intestinal mucosa, the role of astringent. Bifidobacterium and lactobacillus are given to adjust intestinal flora.