Intussusception is a serious problem with the intestine, or bowel.
When intussusception occurs, part of the intestine collapses into itself. This makes the intestines not work properly. Intussusception occurs most commonly in babies between 5 and 9 months of age. Boy babies are affected twice as often as girl babies. Sometimes newborn babies, older children and adults have intussusception, but it's not common in these age groups.