RIRs/BRs guess the sexes :D

[Lmjc]

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I'm aiming for just one roo, but if there's more that's okay

 

[momma of a chicken lover]

I cannot tell at this young age. When the adult feathers and combs begin growing, it is easier to tell. Watch for neck and tail feathers that are longer. Also, posture and behavior. Legs that are thicker can be a clue too. Good luck!

 

[Smoochie]

My guess is all roos but it is still early days...

 

[PioneerPrincess]

I agree with the others; they're still too young to tell for sure. I wouldn't be completely set on going by the looks of the combs though, since some pullets grow their combs faster than others. Just keep an eye out for shiny, pointy saddle feathers and watch for what momma of a chicken lover said.