Children with precardiac disease, generally poor general development and nutrition, and pulmonary vascular congestion, pulmonary edema, easy to cause lung infection, spring weather changes quickly, the temperature difference between day and night, easy to cause these babies to catch a cold, and once the cold than normal children are more likely to cause pneumonia, while pneumonia often aggravate precardiac disease, precardiac disease will also make pneumonia aggravated difficult to cure, and finally lead to severe pneumonia And heart failure, resulting in life-threatening. Therefore, once a respiratory infection occurs, it should be treated actively. How can we protect our children from colds in a simple and effective way? First of all, clothing should be increased and decreased according to weather changes. Some children with precardiac disease sweat a lot and their underwear is often wet, and children with precardiac disease have a heavy heart burden, so it is easy to reduce clothes too quickly in the spring to increase the chances of children getting cold. Therefore, it is recommended to change the child’s clothes and pants regularly, and the child’s underwear should be loose, while often lining the chest and back with a small dry towel and changing it several times a day, so as to keep the skin clean and avoid the child catching a cold. Second, to keep the air circulation in the child’s room, often open the window, usually take the child to the outdoor sun, breathe fresh air, and try to avoid the crowded public places to reduce the chances of respiratory infections. Third, scientific diet. Children with precocious heart disease are generally thin, small diet, it is advisable to eat less and more meals, do not give the child to eat more appetizing drugs in order to eat. The child’s small appetite is largely caused by precardiac disease, after the cure of precardiac disease, appetite will naturally increase, growth will also improve. Fourth, we should try to keep the child quiet to avoid excessive crying and hypoxia. A little older children should combine movement and stillness, to ensure sufficient sleep at night, life should be regular, in order to reduce the burden on the heart. At the same time to keep the stool smooth, avoid dry stool, defecation difficulties when excessive force, excessive force will increase abdominal pressure, increasing the burden on the heart, and even cause serious consequences. Fifth, to actively prevent infection. Before and after any other surgery (including tooth extraction, tonsillectomy, etc.), antibiotics should be used to prevent infective endocarditis. It is also important to get plenty of rest and avoid strenuous exercise and crying to avoid heart failure, thromboembolism, etc. Children encountering a cold do not need to be nervous, but go to the local hospital as soon as possible to avoid delaying treatment.