So far they are all looking pulletish. I'm side-eying the one on the left though. That comb is a little larger and slightly more pink than I'd like to see for a pullet, but she could still be a pullet. Post again in 6-8 weeks to confirm.
Left- on the fence. Nothing is screaming pullet or cockerel at this point, but the comb is slightly bigger than what i'd assume is it's hatch mate. So that would be my 'hope' bird.
Looks like it already has some black spots emerging, so I'd guess as it gets it's adult feathers it will look like a California White with mostly white feathers but some cool spots. I had some White leghorn X Lavender Ameraucana hens that had similar coloring.
Center- if it's a Marans cross- I'd say pullet. They tend to comb-up pretty quickly, but based on its comb compared to the one on the left I think it's a girl.
Right- pretty sure it's a pullet.
Fingers crossed and please post again if you hear a crow, or get an egg!