The common causes of baby foamy stool are indigestion, acute upper respiratory tract infection and enteritis, which are analyzed as follows: 1. indigestion: babies eat high fat, high sugar and other foods, will increase the burden on the baby’s digestive tract, so that the intestinal tract produces a large amount of gas, the symptoms of indigestion, easy to cause the baby foamy stool. 2. Acute respiratory tract infection: the baby’s gastrointestinal function is not yet well developed, when the acute respiratory tract infection can easily lead to a decline in intestinal digestive function, often accompanied by abdominal pain, diarrhea and other symptoms, stool can be foamy. 3. enteritis: baby immunity is poor, when the outside world germs invasion can lead to acute enteritis, in addition to the above symptoms, but also abdominal pain, diarrhea, crying and other phenomena. Foamy baby may also have other reasons, it is recommended to go to the hospital in time for relevant examinations, clear causes and then actively treat the symptoms.