it will not hurt him but it is unnecessary. only two doses are recommended. one at age 1 year and another before kindergarten (age 4-6). occasionally if one of those doses were omitted or more commonly records were lost and parent is unsure if a second dose was given or not another vaccine can be safely given.
is it okay to have three doses of the varicella vaccination? . my son was accidently given three doses of the varicella vaccination since the doctors records were being updated to a new system. they showed he only had one dose and never had the second dose when indeed he had the second dose over a year ago.