In some congenital heart diseases with left-to-right shunt, high pressure in the left heart causes blood to flow through the defective septal orifice channel to the right side of the heart cavity, causing congestion in the pulmonary vessels through the blood circulation to the venous system, so that children with the disease often have colds, coughs and pneumonia. Pneumonia is not easy to heal in children with congenital heart disease, and in severe cases, heart failure and hemolysis may occur, leading to the death of the child with congenital heart disease. Pneumonia can worsen with repeated attacks! In fact, the root cause of recurrent pneumonia in many children is congenital heart disease. Such as common ventricular septal defect, arteriovenous ductus arteriosus and atrial septal defect, which lead to congestion in the lungs of children, elevated pulmonary artery pressure, labored breathing, choking, pulmonary bruising and edema. On this basis, it is easy to cause upper respiratory tract infections such as bronchitis or pneumonia in children with precordial disease. Pneumonia is very easy to repeat clinically, and a little improper care may aggravate the condition. Experts point out that pneumonia also reduces the immune system of children with precocious heart disease, making it more likely that various complications of precocious heart disease will occur, leading to deterioration. Heart failure is a cause of death in children with precocious heart disease! Heart failure means that the heart cannot provide enough blood to meet the physiological needs, so some compensatory mechanisms are used to make up for the lack of heart function. If the compensatory function is not effective, it is more likely to make the heart fail and cause various symptoms, such as increased heart rate, shortness of breath, frequent coughing, laryngeal or croup sounds, liver enlargement, jugular vein anger and edema, etc. Experts point out that the precursors of heart failure are often not obvious, especially in children with precordial disease, which requires parents to be extra careful in the care of their children and, crucially, to receive timely treatment. Finally, experts remind parents that in the process of treating their children with precocious heart disease, not only should they take good care of their daily diet and other aspects, but regular reviews are also important, as they are the main way to detect heart failure and other kinds of complications in a timely manner, so I hope parents will pay enough attention to them.