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If she is passing watery stools
from 3 or more days, you need to get her stool cultured to rule out Rotavirus
Infection which is common in Infancy and childhood. Feed her breast milk as much as you can. Take her to a Pediatrician
and get her examined. Preventing dehydration
is the biggest concern in cases of diarrhea. Offer her an oral rehydration fluid such as ORS in small amount.