Newborns eating breast milk diarrhea may be physiological factors, but also may be related to indigestion, lactose intolerance and other factors, the specific analysis is as follows: 1. physiological factors: newborns because of the newborn soon, so the intestinal tract is not well developed, the digestive function will be relatively weak, after eating breast milk, there may be an increase in the number of stools accompanied by milk petals and so on, if there is no other phenomenon, are a normal physiological situation, without special treatment. 2. Indigestion: If you don’t pay attention to the feeding method and feeding pattern, you may have indigestion and sour odor. 3. Lactose intolerance: Because the newborn’s own digestive enzyme activity is not sufficient, so it can not digest and break down the lactose in breast milk, thus lactose intolerance leads to diarrhea. Newborns eating breast milk diarrhea may have other reasons, it is recommended to go to the hospital in time to carry out relevant examinations, clear cause of the disease after active symptomatic treatment.