After the child is born, parents should carefully observe whether the child has the following symptoms, if so, the child is more likely to have precordial disease: 1, cyanosis (cyanosis): the skin continues to appear cyanosis, the most obvious in the tip of the nose, mouth and lips, finger and toe nail root. Some children have persistent cyanosis after birth, often indicating a very serious condition, commonly such as transposition of the great arteries, complete pulmonary vein ectopic drainage, tricuspid atresia, pulmonary atresia, etc. Some children three to four months after birth cyanosis gradually obvious, in the mouth and lips, finger (toe) nail bed, the tip of the nose is the most obvious, the biggest possibility is the tetralogy of Fallot. 2, heart murmur: normal pediatric heartbeat to the pendulum like a group of two sounds, each one is very clear, if the child’s chest heard between the two sounds there is a blowing wind-like, machine-starting-like sound. Some children can feel tremors in the chest. This indicates that there may be precordial disease. 3, poor physical strength: infants have difficulty feeding or refusing to eat, choking and coughing, often eating and stopping, shortness of breath, pale face, breath-holding, etc. 4, susceptible to respiratory infections: frequent colds, recurrent bronchitis, pneumonia. 5, poor development: normal children within one year of age in the first six months of weight growth of 0.6 kg per month, the second six months of monthly growth of 0.5 kg. Weight growth below this rate indicates delayed development. 6, pestle finger: older children with thick fingers and toes end, dark color 7, squatting: infancy when holding the legs are not straight, but like to bend in the adult’s abdomen, sitting like to lift the feet to the stool surface, standing when the lower limbs to maintain a bent posture. Older children walking, walking for a period of time to squat down two knees close to the chest to rest for a moment, medically known as squatting phenomenon. 8. Other: hoarse crying, shortness of breath and coughing since childhood; elevated precordial area and thoracic deformity. Older children will complain of chest tightness, pain in the precordial region, and panic, and these symptoms are more pronounced especially after activity. Some children may also develop swelling of the lower extremities. If parents find that their children have the above symptoms, they should go to the hospital early to confirm whether they have congenital heart disease. Once congenital heart disease is suspected or diagnosed, the child should go to a specialized pediatric cardiac surgery center as soon as possible, and the timing of surgery will be decided by a specialized pediatric cardiac surgeon.