Green and sour baby stools are triggered by infection, improper feeding, lactose intolerance, milk protein allergy and other factors. Extra-intestinal infections such as bronchitis, respiratory infections may affect the secretion of digestive enzymes, thus causing bacterial imbalance leading to green stools in children. The baby belongs to add complementary food stage, the ability to accept new things is relatively poor, at this time can not be very good according to the prescribed time point to the child to add complementary food, it is easy to cause the situation of dilute stools, at this time can be discontinued after observing the baby’s gastrointestinal peristalsis ability, and then reconsidered to add. Lactose intolerance or milk protein allergy, also easy to cause this situation, once diagnosed can be given amino acid lactose-free milk powder. Normal formula feeding, iron in milk powder or hydrolyzed milk powder can easily lead to green stools, which is physiological and does not need to be treated. If the symptoms are severe or persistently unrelieved, consult a doctor for a definitive diagnosis and follow the doctor’s instructions for treatment.