I'm ambivalent on male circumcision, so my position could go either way depending on multiple factors (e.g., the practical considerations of such a ban). Generally, I believe medical decisions should be left for medical professionals and the family of the child to decide, and since circumcision of males can be necessary in a minority of cases, one argument (among a few) that I can see against a ban is that a minority of children could be denied access to a medically necessary procedure because a doctor feared prosecution after deeming it medically necessary.
On the other hand, the vast majority of children don't need circumcision, and it is a permanent body modification. While the risk of adverse effects during or after the procedure
is quite low, there's also the question of who would bear responsibility for adverse effects from a medically unnecessary circumcision.
This is one of those issues where I can see strong arguments on both sides, so I'm interested to know what others think so that I can consider other perspectives on the subject.