I can sex your pullets and cockerels!

[Boat Chick]

Yes one single comb. Still is small.

Does it have a single comb?

I'm thinking cockerel

 

[black_dove2]

Chick one: male HUGE comb for a young chick

Chick two: female not that big of a comb

I thought my Danish Brown was a Cockerel for a while because she had her comb coming in very early compared to the RIR i have. But she's defa hen and has been laying 6 out of 7 days.

The comb on bird you're referring to is it a breed thing?

 

[chicks are life]

Well there is three things that can contribute to male
Hackle feathers
Saddle feathers
Large red comb and waddles for a young bird

Yes sometime the breed can contribute to the females having a bigger comb at a young age.

Some breeds of female even tend to have slender hackle feathers even if they are female

Ex:
I have had multiple easter eggers have very slender feathers

I have had a couple with saddle feathers that were female
And like you said above his your chicks comb was 2x bigger then your rir

 

[Bladeguy]

Going to post my 6 week old pics. I think I know, but always open to a 2nd, 3rd, 20th opinion!!!

Black Copper Marans, thinking roo.

 

[Bladeguy]

2 Blue Copper Marans, thinking roos.

 

[Bladeguy]

Another Blue Copper Marans, pullet?

 

[Bladeguy]

2 more Black Copper Marans, both pullets? Pic 1 and 2 are the same bird.

 

[Bladeguy]

Another Blue Copper Marans hen?

 

[Bladeguy]

And finally 2 Amerecaunas. One blue, one black. Blue one had me thinking roo at one point, because it is twice the size as the black, but looks like a pullet to me now. Black I think is a pullet.

 

[chicks are life]

All of your guesses I agree with