I don't understand how parents are allowed to make major, irreversible, cosmetic medical decisions for children on their behalf. I'm not against circumcision, but it should be the choice of someone who is able to consent.
Parents are allowed to feed their children the way they want, to take their children to spots where they might get a disease, to pass on their own diseases to their children.
Parents are allowed even to pass on their genes, which may contain horrible psychological tendencies, to their children.