Well of the four I hatched, two purebred BOs and two BO/RIR crosses, I can tell by the legs that I have one of each sex. I am a little thrown by one of them having rather green looking eggs. I coulda sworn none of the green eggs hatched, and my roo was a BO so it just can't be an EE. But the other has more yellow legs. My hen of that same cross from last year has yellow legs, so I think my green legged one must be a roo, so he will eventually go to freezer camp.
That will leave me with a BO roo and two BO hens, I'm thinking of putting them in the little coop together eventually, it would be a good size for three adult chickens. I'm afraid he might kinda wear them out though, one roo for two hens might be too much for them. I guess I will just see what he is like, but I'm pretty sure I have those ones sexed. It is the dang EEs I can't figure out. Because they all have such different colors the shape of the feathers is hard to tell, and I'm clueless about what sounds they make until they start to really crow, I don't hear any smaller chicken sounds.