The concern in your child s case is understood. The watery diarrhoea diarrhoea is viral diarrhea usually. But as your child is formula fed, I would consider an infective cause.YOu would have to do a stool microscopy test.I would advise to stop bottle feed and give only breast milk always. YOu must give boiled water or ORS to prevent dehydration everytime she passes loose stools, in as much quantity as the loose stool lost. Based on this result we can start antibiotics or anti amebic drugs. Hope this answers your query and I will be glad to help further.