K. do not worry. My now 10 yr old son was born with pectus excavatum and is fine. We see an endcronologist at the University of Iowa hospital and he and our MD check it at his yearly check ups. It does depend on how deep it is but it can be fixed as they get older if it is really bad. I have a friend whose oldest son had his fixed in high school and he is perfectly fine. If you read up on it please do not let any imformation scare you, most on line info gives worse case scenario. They say if it gets too bad it can constrict the heart and lungs and that is why it needs to be monitored by your sons MD. It does not slow our son down in any way though. Our son plays football, and soccer, loves to jog ,takes dance and plays a brass instrument in band all things that require major lung function. Good luck I hope this helps . Relax and don't sweat the small stuff. J. -mom of 4 and wife of 1