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Lactose intolerance means your body can’t easily break down or digest lactose. Lactose is a sugar found in milk and milk products.

A liver transplant is surgery to replace a diseased liver with a healthy liver from another person.

Intestinal malrotation is a birth defect. It happens when your baby’s intestinal tract doesn’t form as it should during pregnancy. Malrotation happens when your baby’s intestine doesn’t turn like it should.

Meckel diverticulum is a small pouch in the wall of the intestine. It’s near where the small and large intestines meet. This condition is the most common birth defect of the digestive system. It happens to about 1 in 50 babies.

Tracheoesophageal fistula is a connection between the esophagus and the trachea. The esophagus is the tube that connects the throat to the stomach. The trachea is the tube that connects the throat to the windpipe and lungs. Normally, the esophagus and trachea are two tubes that are not connected.

Detailed information about ulcerative colitis, an inflammatory bowel disease (IBD).

Read on for details about stomach and duodenal ulcers in children. Learn about causes, risk factors, symptoms, diagnosis, and treatment.

Obstructive sleep apnea is a condition that causes a child to briefly stop breathing while sleeping. It happens because of a blockage in the upper airway. The pause in breathing may occur many times in a night, disrupting the child’s sleep.

A branchial cleft abnormality is a cluster of abnormally formed tissue in the neck. A branchial cleft abnormality is a birth defect. It happens when the area doesn't form as it should during the early stages of an embryo’s development.