Month old Speckled Sussexes - any idea?

[mountainchickens]

Hi! These are our Speckled Sussexes, and they're about a month old. Is this too early to tell gender, or does anyone have any ideas? I'm worried that the one with the largest comb is a roo.
(There are 3 chicks, 1 pic of each I think is a girl and 2 pics of the one I think is a boy.)

 

[Azeria]

The last Sussex look like a boy because of the red comb

 

[PirateGirl]

definitely a boy if only a month old

 

[cstephens1987]

Your suspicions appear to be correct