1, in the newborn or infant that feeding difficulties, the child can not wait to eat, but sucking weak, shallow breathing into, often eat stop, pale, breath-holding, feel very tired, sweating profusely. Some children appear to refuse to eat and choke and cough. 2. Recurrent respiratory tract infections are the most common symptoms. Because of lung congestion, mild respiratory infections can easily cause bronchitis and pneumonia, with fever, coughing and shortness of breath, and some babies are hoarse when they cry. The infection recurs. 3, due to insufficient blood flow and blood oxygen supply in the body circulation, growth and development is delayed compared with children of the same age, and their weight lag is more obvious than the length lag, and some serious children can appear anemia and malnutrition. 4. Older children often complain of easy fatigue, poor physical strength, excessive sweating, and even chest pain and syncope. 5.When such children are found to have little urine and sunken edema of the lower limbs and dorsum of the feet, it means that the child has severe cardiac insufficiency. 6.These children usually do not appear cyanosis, but if they are not treated in time, it will cause resistance pulmonary hypertension, resulting in shunting of blood flow from the right heart to the left heart, and cyanosis will appear, which also means that the opportunity of surgery has been lost.