If you felt it was important medically, then I would do it. Sounds like you don't think it's a problem to put it off, so I would put it off. I am guessing they are super safe in that kind of environment, but don't see enough reason to risk it. I know your ds wants to do it, but in my opinion it's an adult decision made with input from the child. His reasons for wanting to do it would not make me change my mind in this case, but that's just how I make my decisions and I know others do it differently.
lucky single mom to 20 yr old dd and 17 yr old ds through 2 very different adoption routes