The sour stools of 1-year-old babies are mostly related to indigestion and intestinal inflammation. Parents should promptly take the baby to the hospital to do routine stool examination, clear diagnosis after symptomatic treatment. Common causes 1, indigestion: baby 1 year old began to gradually add complementary food, with the increase in the variety of food, the digestive system will have a slow process of adaptation, excessive intake of sugar and protein in food, fermentation and decomposition in the role of intestinal bacteria, will cause the appearance of sour stool; 2, intestinal inflammation: baby consumed unclean, cold food, or abdominal cold, easily lead to bacterial infection, causing Inflammation of the intestinal tract, in this case the baby bowel movements increased significantly, and sour smell is obvious. Conditioning method 1, the baby has indigestion symptoms, parents should pay attention to the dietary regulation, it is recommended to feed the baby more rice soup, noodles, thin porridge and other liquid or softer food. If necessary, the baby can be given lactase, probiotics for conditioning under the guidance of a doctor; 2. If the diagnosis is pediatric enteritis, the baby should be given intestinal microbial preparations for conditioning under the guidance of a doctor. Pay attention to give your baby more water to avoid electrolyte disorders due to dehydration.