Congenital heart disease (CHD) is a common heart disorder in pediatrics, caused by abnormal heart development during fetal life. According to relevant statistics, there are more than 4 million children with congenital heart disease in China, and the number of new cases is about 150,000 every year, with about 2 million children with congenital heart disease waiting for surgical treatment. Due to the lack of medical knowledge, family poverty, and limited local medical conditions, many children have delayed the best time for treatment. In fact, if many children with precocious heart disease are detected and treated early, their future growth and development can be exactly the same as that of normal children. In recent years, our hospital has completed more than 1,000 cases of precocious heart surgery each year, 60-70% of which are infants under 6 months old, and the surgical results are good. However, many parents worry that their babies are too young and delay the best time for their children to have surgery. In some cases, the child has been delayed until the age of 7, when the child has severe pulmonary hypertension and heart failure, which makes the treatment more difficult. The principle of treatment for precocious heart disease is “three early”: early detection, early diagnosis and early treatment. The current treatment methods mainly include surgery, interventional therapy and conservative observation of symptomatic treatment. The vast majority of patients with precardiac disease require surgical treatment (including palliative and radical surgery), and a small number of eligible patients can be treated with interventional therapy. Only a very small number of special patients (e.g., small ventricular septal defects or atrial septal defects) eventually heal spontaneously after conservative observation with symptomatic management.