Oatmeal allergy?

Kacey

I gave my little one whole wheat oatmeal for the first time the other day. The following day he had a little bit of diarrhea and diaper rash. Went away the next day. Then 2 days later I have it to him again, and the same thing happened! Is this a slight food allergy? Anyone else's little one seem to not agree with oatmeal?