@saikkia There isn't a hint of pink on that comb. The only thing giving me pause is how naked it is. Some "Leghorns" are bred for wing sexing so the slowness could be a male sign. Leghorns are normally fast feathering and a four-wheek chick is typically fully covered or close to it.
1 and 4 are looking like cockerels and 2 looks promising for pullet with the head poof. It's too early on 3. You either have some very late feathering chicks or only the Polish are 6 weeks.
Of course they are! The males have white down and feather in white, the females have gold to red down and feather in white at first and then orangey red. It really is 99.99% BTW, the only reason it's not 100% is that a male chick occasionally occurs that's white with faint gold stripes and it...