I had one as a small child and outgrew it by the time I hit adulthood. It never caused me any issues. I just had to go to the pediatric cardiologist every 5 years or so to get checked out until it went away.
ETA: If you're concerned about LO going to the cardiologist, please know that the tests they run are NOT painful. All external monitoring. Worst part is getting a kid to sit still :)