This is a pediatric medical practice that takes care of children with diseases of their digestive tract such as abdominal pain, constipation, celiac disease, Crohn's disease, ulcerative colitis, intestinal bleeding, encopresis, colic, chronic diarrhea, vomiting, gastroesophageal reflux disease, ulcer disease, Helicobacter pylori infection, failure to thrive and many more. Colonscopy and upper endoscopy are features of this subspecialty in trying to diagnose complicated intestinal disorders.