I would at least wait a couple more weeks. If he's only 4 weeks old, there may still be a slim chance that it could turn out to be a girl.
No sense throwing in the towel juuuust yet, I'd hold off and wait a couple more weeks before you can def. tell through comb color etc.
My two EE's were almost 4 weeks in this picture, and the one in the back turned out to be a girl (she had the white patches on her shoulders too), and the one in the front a boy. If you notice though, he has a little less feather development and typical red in the shoulders. A week or two later (if that wasn't proof enough), his comb skyrocketed and turned bright red. So I'd hold off and just wait to be sure
I don't want to give you false hope but, EE's can be tricky sometimes, especially if white is involved!
Thanks, I'll wait until S'mores is 8 weeks and then post pics again to see what ppl think. I wish that chickens were easier to sex. :/