The smaller the diameter of the defect, the greater the possibility of self-healing. Atrial septal defect is a very common congenital heart disease. After birth, if a child is found to have this kind of atrial septal defect, it is important to review the cardiac ultrasound regularly, mainly to see if the atrial septal defect has healed, and also to see if there is any effect on the structure of the heart chambers. If the defect does not heal on its own after 6 weeks of age, it is very unlikely that it will heal on its own in the future. This condition is usually cured by interventional blocking, which is the same as normal children and will not affect their future development. Therefore, whether the atrial septal defect can be self-healing, one is based on the size of the defect, the diameter of <5mm, and the other is related to the individual's constitution, so it has the possibility of self-healing. The above content is for reference only, please refer to the doctor's consultation for specific medication and treatment.