Unsure of gender!

[quinsullivan]

When we purchased ten chicks in march we were told they were all hens. A little unsure of that now, as one of them seems to be growing a comb and we're getting our first eggs now, and we aren't quite ready for more chicks at the moment. They're not any bigger than the other hens (arguably smaller), has the same coloring as two other hens, but does seem to be more in charge. I hesitate to use aggressive because they are one of our nicer birds.
Thoughts? (also unsure what breed exactly, but 9/10 of them have ear tufts. It doesn't matter much to us)

Also doesn't want to hold still for pictures!

 

[HappyClucker7]

She is an Easter Egger pullet. Her comb is just getting bigger now because she is ready to lay.

 

[Oncoming Storm]

It looks like it’s got round saddle feathers where roosters have pointed saddle feathers. Combs just get redder as the birds mature. So pullet.

 

[ChocolateMouse]

So these chickens are about 20 weeks? Red combs can indicate laying. They're easter eggers, by the way.
I'm not seeing anything but that comb that screams cockerel. I'd keep an eye on it, but by 16 weeks all of my cockerels had pointed saddle feathers and were crowing. So I think this is a pullet through and through, just one with a chunky comb.

 

[The Happster]

All definitely pullets!

 

[Rhodebar Lover]

I agree!! She is most likely already laying!