Thanks for the suggestions, we did food allergy testing last week and go back this week to discuss with the dr. His tongue looks normal. He has been tested for Celiac disease but that came back negative.
things to look into would be a food allergy, gluten allergy. Also, what does his tongue look like? By any chance does it look like it has a white fuzzy coat? If so, he could have a candida overgrowth.