Why Does My 9 Year Old Complain Stomach Feels Weird? in Gluten-Free Foods, Products, Shopping & Medications Posted January 26, 2010 · Report to Admin I have had my son on a gluten free diet for two weeks. He does not have Celiac but instead a possible gluten intolerance. For the past two days he has been telling me his stomach feels weird. Has anyone experienced this when starting their gluten free diet?