As medical care continues to improve, the detection rate of precocious heart disease in infants and children has increased. Approximately 1/2 of children with precocious heart disease die within the first year of life due to severe heart malformations. Survivors are prone to recurrent respiratory infections and other diseases that lead to developmental disorders at all ages of growth and development. In mild cases, there may be no obvious symptoms early on, but the precordial murmur may affect the child’s schooling and future employment, and if left untreated, it may eventually lead to pulmonary hypertension, heart enlargement or even heart failure. Therefore, for parents, they should usually pay more attention to observe their children, and once these following manifestations appear, they should go to the regular hospital for examination in order to let their children get timely diagnosis and treatment: 1. Heart auscultation: normal children’s heartbeat is like a pendulum, a group of two sounds, each one is clear; children with precordial heart disease can be heard in the chest with a blowing wind-like or machine-starting-like sound between the two sounds, and some children can feel tremors in the chest. 2, mouth and lips, fingers and toes nail bed bruising, or cry after the appearance of the mouth and lips bruising. 3. Frequent occurrence of colds, pneumonia and other respiratory diseases. 4. Poorer growth and body wasting than children of the same age. 5. Infants usually have shortness of breath, difficulty in breastfeeding, often coughing and choking, breath-holding and other symptoms. 6. Poor physical strength, easy to appear shortness of breath and fatigue after activities. 7. There is the phenomenon of squatting: when sitting, they like to lift their feet up, even to the stool; after walking for a while, they will squat down and rest for a moment with both knees close to the chest. If the child has the above symptoms, it means that the possibility of suffering from precordial disease is relatively large, should promptly go to the regular hospital for examination to clarify whether it is suffering from precordial disease, so that the child can receive timely and effective treatment.