Can an atrial septal defect 4mm heal itself?

Atrial septal defect (ASD) is a common congenital heart disease, mainly due to the abnormality of the original atrial septum during embryonic development. The patient is currently an ASD 4mm, if the age is less than two years, there is a possibility of self-healing. However, if the age is more than two years, it can be observed for half a year. If it still does not heal, surgery should be performed as soon as possible.