My 6 month old son has had diarrhea for the past week and every single diaper I change him he has had diarrhea in every diaper. They has not been one single pee diaper without the poop and he is teething and has very server diaper rash. I am using desitin diaper rash cream along with baby powder. Do I give him pedalite all day instead of formula until the diarrhea stops and is desitin the right thing to use for a very bad diaper rash?