It varies depending on the degree of recurrence of the malformation and age, etc. Light congenital heart disease may have no special symptoms, normal growth and development, and only a rough and loud murmur is found in the left chest during physical examination. Common clinical manifestations include: Cyanosis: Cyanosis is a prominent manifestation of cyanotic congenital heart disease (e.g., large vessel misalignment, tetralogy of Fallot, etc.). It can persist after birth or become apparent gradually three to four months after birth, and is most obvious in the lips of the mouth, the beds of the finger (toe) nails, and the tip of the nose. In contrast, latent cyanotic heart disease (such as ventricular septal defect, atrial septal defect, and patent ductus arteriosus) usually does not have cyanosis, but only appears when moving, crying, holding one’s breath, or suffering from pneumonia, and persistent cyanosis can appear when pulmonary hypertension and right heart failure occur in late stages. Heart murmur: Most congenital heart disease can be heard as a murmur, which is relatively loud and rough and can be accompanied by tremor in the anterior chest area in severe cases. Most heart murmurs are detected by the physician at the time of the visit. Some normal children may have a physiological murmur. Poor physical strength: Due to poor cardiac function, insufficient blood supply and hypoxia, seriously ill children have feeding difficulties in infancy, stopping after a few sips, shortness of breath, easy vomiting and profuse sweating, prefer to be held vertically, older children are reluctant to move, prefer to squat, easy fatigue after activity, paroxysmal dyspnea, severe hypoxia often faints suddenly when nursing, crying or stooling, and are prone to heart failure. The two are often the cause and effect of each other and become the cause of death in congenital heart disease. Poor development: congenital heart disease has more developmental delays, especially in those with cyanosis, and in severe cases, intellectual development may also be affected. In addition, if the left atrium of congenital heart disease is enlarged or the pulmonary artery compresses the recurrent laryngeal nerve, the cry will be hoarse, shortness of breath and coughing since childhood; it can be combined with other malformations, such as congenital cataract, cleft lip and palate and congenital stupidity, etc.; the enlarged ventricle can cause bulging of the precordial area and thoracic deformity; persistent cyanosis can be accompanied by pestle finger, which is formed 1 to 2 years after the appearance of cyanosis.