Pediatric congenital heart disease occupies a large proportion of our country and is a major killer that threatens children’s health. To avoid the appearance of pediatric congenital heart disease, it is essential to do prevention work. What is pediatric heart disease? The main harm of congenital heart disease to children is that it can cause blood supply disorders to the tissues and organs of the body, resulting in tissue hypoxia, which affects the growth and development of children; it causes increased blood flow to the lungs and children are prone to recurrent lung infections; hemodynamic abnormalities can also increase the burden on the heart and cause heart failure, malignant arrhythmia and even sudden death; abnormal heart structure can cause damage to the local endocardial structure and make it easy for infective endocarditis to occur. The heart structure abnormality will cause damage to the local endocardial structure, which may lead to infective endocarditis. Precordial disease can also cause psychological damage and bring impact to the family of the affected child. Eight manifestations of babies need to be alerted Parents should be more attentive in their daily lives to observe the following manifestations of children should be alerted to the possibility of precardiac disease, promptly take the child to a specialist hospital for detailed examination: 1, often cold, recurrent bronchitis, pneumonia; 2, feeding difficulties, infants refuse to eat, choking cough, often eat stop, shortness of breath, pale, breath-holding, etc.; 3, the skin continues to appear cyanosis 4.When walking or playing, they often crouch down for a moment on their own initiative (crouching phenomenon); 5.Older children’s fingers and toes appear coarse and dark at the end; 6.Easy fatigue, poor physical strength, excessive sweating, blue around the mouth, hemoptysis; 7.Unusual development, manifested as thin, malnutrition, developmental delay; 8.Often chest pain, fainting. Do the following can effectively prevent pediatric precocious heart disease: 1, living space should be fresh air, sunlight, exposure to radioactive substances is strictly prohibited, avoid working and living in an environment with heavy air pollution. 2, pregnant women supplemented with folic acid has a significant effect on the prevention of congenital heart disease in infants, the mother in the early stages of pregnancy supplemented with folic acid can reduce the occurrence of infant precocious heart disease, especially critical and complex precocious heart disease. 3, the consumption of fresh vegetables should be soaked in water several times to reduce residual pesticides. 4, do not smoke, do not drink alcohol. Although the prevalence of pediatric precocious heart disease in China is high, but is not born with an incurable disease, as long as timely surgical treatment, children have a chance to restore health. Along with the continuous improvement of surgical techniques and the continuous improvement of surgical instruments and sutures, cardiac surgery has developed to a high level. Almost all precardiac diseases can be well treated surgically with early detection, early diagnosis and timely treatment.