My child is suffering from frequent loose motion(watery structure). Almost every month. What could be the reason. And she is not all drinking ors.what could be the reason. (16 months old baby girl)

A. Loose motion are most of the time infective where it is associated with fever and vomiting and its knotwn as gastroenteritis where symptomatic treatment along with management for dehydration is required if loose motions are associated with foul smell mucous xhigh grade fever than it could be bacterial infection which needs antibiotics treatment