One-year-old baby watery stools may be related to enteritis, gastrointestinal dysfunction, etc., the specific analysis is as follows: 1. enteritis: one year old baby watery stool may be caused by bacterial or viral infection of the intestinal tract, intestinal irritation caused by watery stool, may also be accompanied by sour odor, containing foam and other abnormalities. 2. Gastrointestinal dysfunction: the baby may have eaten too much or eaten food that is not easy to digest, gastrointestinal dysfunction caused by the occurrence of watery stools, may also produce severe diarrhea symptoms. 1 year old baby watery stools may also be related to other causes, it is recommended to go to the hospital in a timely manner for relevant examinations, clear cause and symptomatic treatment.