What I would say to that is in a country like Uganda/Nigeria, were the healthcare isn't good and expensive, you can see why it's best to do it as a newborn. Circumcision at a later age would be life threatening because of infection. Having a foreskin could be life threatening if it gets infected, STIs such as herpes is of less of a risk.
If it is banned this will be driven underground, then we have to decide punishment. Now do we remove children because of this, all (even the emotionally bonded older daughter) some (just boys)? Put people in prison? We'd have to have clear strategies.
@Ponoka7 No, it's not best to do it as a newborn! It's best to not do it at all, now if I am adult male in Nigeria, Uganda or anywhere else in the world wishes to take the risk of infection then good for him! A baby does not. It is mutilation. STIs?! Stop fucking people with Herpes then and it'll be even less of a risk, or, I don't know, use a condom? No condom? Don't have sex.
And yes, we would have to have clear strategies, absolutely. Anything to protect babies being mutilated in the name of religion or culture. Again, as per my first post, it is child abuse and people doing it in the name of religion or culture are brain dead.