Hello,Im not any expert,but i do believe I have read and heard of cases thet it's possible a child may return to normal as they grow,it is possible that he could possibly out grow this,as he ages,I would keep a check on things as if he starts having possibly fatique issues,or if the mummor gets worse,thenI would take him to the Doctors for a total check up on his Heart,it is possibly they also,may have medications,to control this problem.But my best advise would to be sure and for Peace of mind to contact his doctor,or even call a regular heart group and I would think they would at least be able to answer your concerns over the phone.Jim