Ventricular septal defect is one of the most common congenital heart diseases, and its impact on development mainly depends on the size of the ventricular septal defect, as follows: 1, if the small ventricular septal defect, such as 1-2mm ventricular septal defect, does not have any impact on heart development, and does not require surgical treatment, because the small defect, with very small blood flow shunting from the left to the right ventricle, does not have any impact on heart function, so it does not require surgical If the defect is relatively large, for example, above 5mm or even 1-2cm, the blood flow from the left to the right is too large, so that a lot of blood is shunted to the pulmonary artery, to the pulmonary circulation, and then to the right atrium, left atrium, and left ventricle, resulting in some blood doing ineffective circulation in the lungs, so that the blood supplied to the body by the body circulation is significantly reduced, thus making the child nutritionally deficient, which seriously affects the growth and development of the child, and In addition, it will cause recurrent respiratory tract infections, because the blood flow in the lungs is too much, more blood in the lungs will easily lead to recurrent respiratory infections, serious pneumonia, and pneumonia is very difficult to treat, will be repeated, difficult to cure; increased burden on the heart will also cause chronic heart failure, chronic heart failure of children will increase respiratory rate, heart rate increases, growth If the defect is moderately large, for example, about 3-6 mm, it will have a little impact on physical development, but it is not too big. Patients can have annual ultrasound to see their heart function status, heart size, and evaluate their heart development and how well their heart function is developing to decide the best time for surgery so as not to delay the patient’s treatment. If we wait until after the pulmonary hypertension to do the surgery, it will delay the patient’s treatment.