What age do pullets and Cockerals begin to get there combs?

[Chickemee]

My first hatched chick is now six weeks old and is started getting its comb about a week ago and my sisters chick started getting its comb at about 3 weeks old. Are they both boys or is 1 or both girls?

 

[Dawn419]

Could you post pictures? It would make it easier to tell possibly. What breeds are they?

I guessed one of our Easter Egger boys at 6 weeks, just because his comb was bigger than everyone elses, plus he began his crowing attempts at the same time.

Dawn

 

[Chickemee]

I would post pics but for some reason my comuter won't let me make a photobucket. My sisters chick is a buttercup and mine looks sort of like a astorlorp. Neither of them had tried crowing yet.