###Human: How likely is that OS ASD will cure on its own in a baby? ###Assistant: Hi. The treatment of atrial septal defect in neonate or infant depends on the size of the defect and clinical condition of the child. If the child is stable, it can be left alone and sometimes it closes by the age of 3 years. If still, the problem persists, the surgical closure is recommended. Small or moderate size, not causing any complication may be left alone. A regular follow up with pediatrician and pediatric cardiologist is recommended. Heart defect may lead to a recurrent chest infection and breathing problem. So the child needs utmost care.