1, to avoid infection, avoid the child to the crowded environment, home often open the window ventilation, air disinfection (vinegar fumigation, etc.), 2, seriously ill children should not be excessive exercise, so as not to additionally increase the burden on the heart. Lv Haitao, Cardiovascular Department, Children’s Hospital of Soochow University 3, children with cyanotic precordial disease like to flexion or squatting position, which is the performance of compensatory hypoxia, should not be forcibly changed to avoid danger.