Atrial septal defects are quite common in newborns, with a roughly 30% chance of occurring. Because of the small size of the defect in infancy, the symptoms are not obvious and do not attract enough attention from parents. As they grow older, a significant number of cases are not detected until adulthood. Patients are leaner, have poorer stamina, and experience shortness of breath after a little activity. Some newborns are born with other congenital heart conditions, such as ductus arteriosus. It is caused by maternal infection or prolonged stay in a radioactive environment during fetal development. If a pregnant woman develops diabetes or other diseases, the medication process can also increase the chance of developing the disease. Surgical repair of this disease is the best treatment, and most are treated before school age, after which symptoms can be significantly relieved.