The medical benefits are modest at best, and are no justification for violating the baby’s right to an intact body.
Reduced STDs? The increased safety is negligible in comparison to the safety provided by condoms. HPV? You can and should get your boys HPV vaccinated. HIV? Do you seriously want to tell your kid that you cut the tip of his dick off to help protect him should he decide to stick it in HIV+ people? Why yes, son, just in case you turned out to be gay.
The real motivations for circumcising boys boil down to conformism and religion. Both of those arguments are equally well made for female genital mutilation, which we happily abhor.
This is male genital mutilation, and it is sickening.