I think it's disgusting that people body mod babies. It's something that should be left up to an adult to make if they want to make. I feel the same if someone but gages (holes in the ears of babies) or tattoos.
Personally, I think guys with foreskin are having more fun in bed that guys who are cut. Was just talking to a friend that had it done as an adult and he said he totally gets why it's unnecessary. (I don't know why he had it done, may have been a military thing.)
So about against it as one can be, unless he is an adult then it's his body to do as he pleases.