MY SON , WHO IS 12 WAS TOLD HE MAY HAVE A HEART MURMUR. ARE THERE ANY LIMITATIONS AS TO WHAT HE COULD DO , HE HASN T HAD AN ULTRA SOUND YET, HE WAS ASKED TO CROUCH DOWN, AND THE MURMUR DISAPPEARED, AND IN MOST KIDS HE WAS TOLD IT NORMALLY GOT WORSE. YOU CAN REPLY TO YYYY@YYYY , THANKS