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Thank you for the input.Diarrhea can occur from a gastrointestinal infection.Here the urine output would be low from dehydration.Fluid loss, low intake can cause it.I would suggest to have an examination by his doctor again.Stool test, blood work would help to find the type of infection.In case of bacterial infection, antibiotic will be needed.
Pedialyte is good.
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Wish his healthy life.