In the early stages of intussusception, the child generally remains in good condition, with normal body temperature and no symptoms of systemic poisoning. As the disease progresses and worsens, complications such as intestinal necrosis or peritonitis may develop, leading to deterioration of the overall condition. At this point, severe dehydration, high fever, lethargy, coma, and shock, among other symptoms of poisoning, can occur. Therefore, fever can indeed appear in the later stages of intussusception.