1 year old babies with dilute watery stools may be related to immaturity of the digestive system, intestinal flora imbalance, infections and so on. 1. immature digestive system: gastric acid and digestive enzyme secretion, low enzyme activity, can not adapt to the food material and quantity of large changes. It is easy to have digestive tract dysfunction, resulting in the phenomenon of dilute watery stools. 2. Intestinal flora imbalance: normal intestinal flora has an antagonistic effect on invading pathogenic microorganisms. If the baby is taking antibiotics, it is easy to lead to intestinal flora imbalance, prone to dilute watery stools. 3. Infection: may be eating food or eating utensils contaminated by bacteria or viruses, when the baby resistance is low, it is easy to cause intestinal infections, infectious diarrhea, diarrhea and watery stools. 1 year old baby dilute water stool can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, in the doctor’s help to clarify the cause, and targeted treatment or treatment.