There are several possible causes of watery stools in babies: 1, the baby is cold or improper diet leading to indigestion, diarrhea, stool traits change, the stool is not formed or watery. 2, autumn diarrhea, rotavirus infection caused by diarrhea, stools are watery, the number of stools increased, more than three times a day is called diarrhea, this situation to prevent dehydration, usually with oral rehydration sodium salt to correct dehydration, or oral salt rice soup or 3, in addition, if the stool with pus and blood, most likely there is the possibility of bacterial dysentery.