There are many reasons for children’s sour stool odor, such as indigestion, infectious diarrhea and so on. 1. Indigestion: due to eating too much food or too much food, especially too much protein food, the food is not fully digested and remains in the intestine for a long time, causing fermentation and leading to sour odor. 2. Infectious diarrhea: diarrhea caused by intestinal infections, eating unhygienic food leads to intestinal mucosal damage, intestinal absorption of water is weakened, resulting in diarrhea, which can be accompanied by a sour smell of stool, while some children have fever, vomiting and other symptoms. There may be other reasons for the sour odor of children’s stool, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.