What about changing the sex of the child born to take away the risk of it being born with congenital dissorders that normally only males can be born with? A large number of cengenital dissorders do only effect one gender (normally male) and this could be avoided simply by making your child a girl.
Any reason other than medical and it becomes imoral IMO but dont even try and say that its gods will or life will find a way, that may be your belief and thats fine but using that as a reason not to allow this is just the same as forcing your belief on the masses (well it would be if that was the reasoning that leads to the ban being made permanent).
And life will find a way? Does that mean our offspring will become pondering 50ft long meat-eating reptiles?

just kidding