Atrial septal defect in newborns, its treatment depends on the size of the defect, how the child’s general condition is, and whether there are other abnormalities to determine his treatment. If the diameter of the atrial septal defect is less than 3mm, the child’s general condition is relatively good, and can be closed naturally in about 3 months, at which time a review can be done, usually in 3-6 months for review. If the child’s atrial septal defect is larger than 8mm in diameter, the probability of natural closure is very low, or if the atrial septal defect is relatively large, surgical treatment or catheter-based interventional occlusion is required. Since surgery is more invasive and has a longer recovery time, catheterization is currently done in more children, but only if the indications are met. In addition, if the child’s general condition is not good, if he has recurrent pneumonia, or if he has significant growth restriction, it is recommended that he be evaluated in a large hospital before treatment.