They all look like girls to me, but I'm not sure about them, it may be a week early yet to tell by the crest. Basically it goes like this: If the feathers sort of round over from front to back, it's a girl. If they look more like Bart Simpson, it's a guy. At first though, even the girl's "hair" seems to stick straight up for a while. I had it easy with mine: the one roo already had a comb by 3 weeks
(the comb kind of looks like two little horns)