Pre-infantile intussusception is characterized by symptoms such as abdominal pain, vomiting, bloody stools, and abdominal masses. 1. Abdominal pain: infants have sudden onset of severe regular paroxysmal colic. It lasts for about 10-20 minutes and then subsides, and then recurs after a break, mainly in the form of sudden and violent crying. 2. Vomiting: at first it contains milk lumps and food residues, later it may contain bile, and in the late stage, it may vomit feces-like liquid. 3. Bloody stools: most patients pass jam-like mucus blood stools after the onset of the disease. 4. Abdominal mass: in most patients, a lump with slight tenderness can be detected in the right lower abdomen, which can be moved slightly. With the prolongation of the disease, the aggravation of the condition can be complicated by intestinal necrosis and peritonitis, and in severe cases, dehydration, coma and even shock. Infantile intussusception is more serious, once diagnosed, should be hospitalized in time for treatment.