5 month old was diagnosed with fifths disease. she now has mild diarrhea, can i give her pedialyte? if so, how much and often?

Yes.: Pedialyte is important for hydration. not free or tap water. Pedialyte replaces essential salts lost in the stool, urine and sweat. A good starter for volume is the same amount that the child normally takes in formula or breast milk. If the child is unable to take at least this amount then a local physician needs to evaluate in person.