Baby diarrhea with sour odor may be caused by indigestion, chronic inflammation of the intestinal tract, intestinal flora imbalance and so on. 1 indigestion: the baby’s digestive system is not yet mature, gastric acid and digestive enzyme secretion are less than adults, and enzyme vitality is not high, can not adapt to the food quality and quantity of large changes. Because when the baby has indigestion, it will lead to excessive fermentation of food in the intestines, which will cause the phenomenon of sour odor when diarrhea occurs. 2. Chronic inflammation of the intestinal tract: Chronic enteritis is caused by a variety of factors, such as infection, resulting in chronic inflammation of the mucosa of the intestinal tract. As the intestinal tract is stimulated by the inflammation, it will cause hyperactive intestinal peristalsis, resulting in diarrhea. And the slowing down of intestinal peristalsis will lead to the accumulation of feces in the body, and the long-term accumulation of feces in the body will cause bacterial hyperplasia, which will cause the feces to smell bad. 3. Intestinal flora imbalance: babies with intestinal flora imbalance are also prone to diarrhea with sour smell. In daily life, if the baby does not pay attention to diet, often overeating, or eating too much greasy spicy stimulating food, in the long run will cause intestinal flora imbalance, resulting in severe diarrhea. Baby diarrhea sour smell may have other reasons, it is recommended to consult a doctor in a timely manner, after a clear diagnosis of targeted treatment, so as not to delay the condition.