1, in newborns or infants that is difficult to feed, the child can not wait to eat, but sucking weakness, shallow breathing, often eat and stop eating, pale, breath holding, feeling tired, sweating. Some children appear to refuse to eat, choking and coughing. 2.Recurrent respiratory infection is the most common symptom. Due to lung congestion, mild respiratory infections can easily cause bronchitis and pneumonia, fever, cough, shortness of breath, and some babies are hoarse when crying. Recurrent infections are difficult to treat. 3, due to insufficient blood flow and oxygen supply in the body circulation, growth and development is delayed compared to children of the same age, its weight lag is more obvious than the length of the backwardness of the part of the serious children may appear anemia and malnutrition. Elderly children often complain of fatigue, poor physical strength, sweating, and even chest pain and fainting. 5.When these children are found to have low urine output and depressed edema of the lower limbs and dorsum of the feet, it means that the children have developed severe cardiac insufficiency. 6, such children generally do not appear cyanosis, but if not treated in time, causing resistance pulmonary hypertension, resulting in blood flow right heart to left heart shunt can appear cyanosis, also indicates that the opportunity for surgery has been lost.