Thanks girls I've read about the Nuss procedure and hope it doesn't come to that even though apparently it has an extremely high success rate. Like I said, his heart rate and breathing have never been a problem, infact the opposite: when he was in utero my carers always commented on his good, regular, strong heart rate. Apparently boys can become extremely self conscious about it and start to hunch over etc so I hope that doen't occur. I'll fill you in after I see my GP.