The reason for the baby’s loose stools may be related to abdominal cold, lactose intolerance, indigestion, gastroenteritis and so on. 1. Abdominal cold: the baby appeared thin stools, can not be ruled out due to abdominal cold, gastrointestinal peristalsis accelerated, the food is not fully digested out of the body due. 2. Lactose intolerance: some babies may lack the lactase enzyme that digests lactose, so they may have bloating, abdominal pain, or even diarrhea after eating dairy products, and the shape of their stools may also change, resulting in loose stools. 3. Indigestion: Some babies may have symptoms of indigestion due to overeating and Helicobacter pylori infection, which will not only cause bloating and abdominal pain, but also cause loose stools. 4. Gastroenteritis: babies in the intestinal tract by bacteria, viruses and other pathogens infection, will affect the gastrointestinal function, will also produce symptoms of loose stools. The baby’s loose stool is likely to have other causes, need to cooperate with the doctor to do further examination, clear cause and then do treatment and treatment.