Infants with atrial septal defect belong to a manifestation of congenital heart disease. If the infant is in good health and does not have any uncomfortable reaction, no special treatment can be done for the time being, and parents can take their children for regular checkups and ask the doctor to adopt a suitable plan for treatment according to the specific situation. I. Main etiology and symptoms: Atrial septal defect is associated with genetic factors, exposure of the mother to radioactivity during pregnancy, viral infection, and environmental pollution. The two atria of the child are not connected, causing blood from the left atrium to enter the right atrium through the defect, and the child will hear a murmur in the heart when a physical examination is performed for auscultation. If the defect is large, it can cause lung congestion, hypoxia, and a blue-purple color on the body, accompanied by shortness of breath, low milk intake, weak cry, and cyanosis of the lips. Due to the increased blood circulation in the lungs, the child may develop recurrent respiratory infections and even heart failure. Second, the treatment: 1, found in infancy with atrial septal defect, but not accompanied by vascular malformation, can be temporarily observed, generally small atrial septal defect, the impact on the child is not very serious, some children with age, will close on their own, parents are recommended to do regular echocardiography every three months until the child is three years old. 2, atrial septal defect is relatively large, large fractional flow, the impact on the child’s development More serious, interventional surgery or open-heart treatment should be performed during the age of 3-6 years to block the atrial septum by blocking. Caution: If children have untreated atrial septal defect, it is better not to do intense sports such as rock climbing and sprinting in daily life.