A comprehensive fellowship module covering the diagnosis and management of pediatric small bowel and colonic disease — celiac disease, inflammatory bowel disease, functional GI disorders, Hirschsprung disease, chronic diarrhea, food-protein allergic disorders, and polyposis syndromes. This is the single largest category in the SCFHS Pediatric Gastroenterology, Hepatology & Nutrition Fellowship written-exam blueprint, weighted at 28%.