I see a definite no doubt pullet (the mostly white one with black markings) and two "not quite too sures" - They look like pullets all but for their coloration. The reddish one even as pointed out has some very boyish feather features coming in. If a red, orange, or brown chick starts developing solid deep red feathers in the wings and back, that's a boy.
So the question is to the OP - In your personal view when you pick the chick up, are there any solid reddish feathers on the wings or back that are different from the rest? Darker, glossy in the light, slightly pointed, having toothy edging? If so - Boy. If not, - Girl.
Same goes for the mostly black one, however that one may have a better chance of being a girl. The main thing that has me thinking otherwise are its contrasting markings on the secondary feathers and the fact that it looks almost like a melanized duckwing, but, it could just be a silver gal with recessive duckwing and the pattern gene, who knows. It appears a girl so far though.
Wait 2 more weeks and things will become a LOT more clear.
