They look to be rounded, suggesting hen but like I said I wouldn't give up because that crest is the most crazy thing on these birds, its so hard to tell.
I got some silkie (hard to sex) and cochin (easy to sex) and I got 2 boys, both with rounded neck feathers but with big combs, since you cant really comb sex polish I would say wait a few weeks until it develops more. Really adorable, I hope its a hen ^^