A Pediatric Gastroenterologist is a doctor who has completed specialized training and experience in pediatric gastroenterology to be able to treat children with digestive, liver or nutritional problems. Pediatric gastroenterologists also treat bleeding, swallowing problems, or other problems encountered in the intestines. They have extensive expertise in managing nutritional problems in children, including placement and management of feeding tubes, intravenous nutrition and diagnosing and treating infants, children, and teens with liver disease.