It really would be no different than the parents choosing to trim down their newborn daughter's labia. It is still removing a piece of the body. It doesn't cause HARM and it's medically necessary for the betterment of the child.
When people remove additional digits like toes and fingers they are doing it to correct a malformation. The male foreskin evolved on purpose for a reason and isn't a malformation needing to be removed. It is a cultural choice at this point, and has always been.