Heart murmur..

I know that it is very common for a little one to get a heart murmur and that normally they correct themselves. But I just have this gut feeling that it’s going to be something serious.... my doctor is keeping an eye on it and if it hasn’t gone away by my lo’s next appointment then they will send us to a specialist. But I’m just wondering how many of you moms out there have dealt with a lo having a heart murmur and if it went away on its on or was something more serious?