Pullet or roo??

[Shearert]

Anyone want to take a guess?
The pictures aren't sorted very well but I have them numbered. They are 5 weeks old, my guess is 2 and 3 are pullets and 1 and 4 are roosters! I'm just judging by the red vs yellow comb as that is the only thing I know to look for!
I have 3 other chicks aswell but couldn't get any good pictures!

 

[The Happster]

1 is a roo without a doubt.
4 also looks like a boy.
Can't see 2 & 3 very clearly but from what I can see, probable pullets like you said.

 

[Gray Farms]

3 looks like the only pullet to me.