Don't do. In the majority of the world only the guys that have phimosis do it. Let him have the possibility to choose if he really wants. Probably as the majority of people that are not circumcised during childhood he will also choose to not do. You (and him) will never forgive yourself if something bad happens during the surgery now.
PS.: I really think that circumcisions are so common in U.S. because medical doctors push it in order to make more money. Circumcisions are, indeed, not free.