Ok - currently the inability of the infant to consent does not prevent circumcisions being assumed to be lawful, if the parents consent on behalf of the infant. So in relation to this particular issue the infant's lack of consent is not the over-riding consideration until a test case decides otherwise.
So far so unremarkable - in any surgery on an infant parental consent is required, but you are missing the key points, which are that:
1. The operation cannot be reasonably delayed until a point when the child is capably of consenting.
2. Parents saying they want it done is completely irrelevant (infants aren't their parents' plaything) - the decision must be in the best interest of the child.
3. That any benefit must significantly outweigh the risks
It is on these elements that the assessment seems unduly lax compared to comparable consent to surgery on an infant. And that laxity, in my view, is due to a reluctance to offend the sensitivities of religious groups.