Intussusception in a four-and-a-half year old child is a condition in which part of the intestinal tube is lodged in the lumen of the connected intestine, causing obstruction to the passage of intestinal contents. Intussusception in a four and a half year old child should be treated promptly. The main symptoms of intussusception include abdominal pain, vomiting, abdominal distension, abdominal mass, and jam-like or bloody stools. The clinical symptoms of intussusception in children are sometimes atypical, with a slow onset and mostly characterized by incomplete intestinal obstruction. Intussusception is usually treated with non-surgical treatments, such as air enema and other restorative therapies, and can mostly be cured. If the onset of the disease is long or the non-surgical restoration is unsuccessful, timely surgical treatment should be carried out. If intussusception is not treated in time, it is a life-threatening disease. Once diagnosed, you should go to the hospital immediately and be treated under the guidance of your doctor.