ASD is a not a very "worrisome" problem for most Pediatric Cardiologists anymore.
A long time ago, it was treated by surgical intervention.
Which still has great results.
Today- it is done by what's called cardiac catheterization
This non-surgical approach uses a tube-like catheter that is usually inserted into an artery
in the groin of the patient and guided to the heart using constant motion x-ray.
An umbrella-like device is attached to the catheter and blown up into place of the hole and it is effectively closed.
The heart then grows tissue around the device and it almost always stays closed.
Intervention depends on the size of hole.
Recurrence is extremely rare, but seeing how there is a chance, your child will require lifelong follow-up from a pediatric cardiologist.
ASD is a minor issue and children will live a normal life without heart problems related to that issue in almost every case.
If your child had to have a heart problem, holes in the heart are probably the one pediatric cardiologists would pick for themselves as they are relatively simple to fix.
Holes in the heart are a common occurrence in pediatric cardiology patients and there are much more complex issues that require repeated surgical intervention. I had 5 heart surgeries as a child myself.
Best of luck to you!