The fact that a breastfed baby has particularly sour and smelly feces means that the baby may be related to gastrointestinal disorders and indigestion, which can be treated with general therapy and medication. 1. Gastrointestinal dysfunction: If the child does not do a good job of keeping warm or eat something cold, it is easy to cause gastrointestinal dysfunction, the feces is very sour and smelly situation. At this time, you need to pay attention to the warmth of the abdomen, you can add clothing, can also be used to put a warm hot water bag on the child’s abdomen to relieve. 2. Indigestion: If the child eats too much milk or supplemental food at one time, it is easy to lead to indigestion, aggravating the burden of digestive function, and there will also be a sour odor of stool. At this time, you can give your baby some probiotics, such as Bacillus subtilis bifidus granules to regulate intestinal flora, to improve gastrointestinal dysfunction. In addition, the baby’s diet must be regular, do not eat too much milk powder at one time, in addition to add complementary foods in a gradual manner, the baby’s stomach and intestines have certain benefits. It is recommended that infants with the above symptoms promptly seek medical treatment.