In children with atrial septal defect, it can be seen according to the site and size. If the atrial septal defect is relatively small, it can be closely observed with regular follow-up and regular ultrasound to observe the heart condition. If the septal defect is large, basically 10 mm or more, further surgery or intervention is needed. Most of the atrial septal defects are secondary to foramen ovale, and the defect is located in the center of the atrial septum. If the defect is large or in a special area, there is no interventional treatment and the only way to treat the defect is through open-heart surgery. One is the traditional open-chest surgery where the scar is in the middle of the child’s chest, and the other is to make an incision in the right axilla for atrial septal defect repair surgery, which is more concealed and beautiful, but the surgery is relatively demanding for the surgeon, and the decision of what to do about atrial septal defect should be made in conjunction with the local hospital and the doctor’s specific situation. Overall, the atrial defect is relatively large and should receive intervention as early as possible, and you can refer to your doctor’s professional opinion on how to do it.