Sexing 4 week old chicks

[Beckychick11]

Need some help with some of my batch. 1 is a blue French marans. 2 are black copper marans, and 2 are Easter eggers. If I can sex these, I can compare to the others. I believe Pattie is a Petey, and Fawn might be a Fred!

 

[Cyprus]

The first black one and the grey ones are cockerels.
The other three look like pullets.

 

[Beckychick11]

my blue one?! I knew the black one, but was hoping not my blue. I have another blue with same size comb Thank you