Hi, thanks for the query.
Due to diarrhea
there is loss of plenty of fluids from body.
With this loss of fluid we also loose many essential minerals form body.
Since child is fine according to you so medicine is not required at all ,but replacements of fluid is necessary.
O R S powder is o t s ( over the counter) product so please give this powder for 4-5 days 3-4 times in day.
Good luck. Dr. HET