Ya it could be that but look at the first's comb and then the 2nd's, they 2nd's is about the same as the 3rd's comb. It is noticeable that their legs (1st, 2nd) are larger then 3rd's.
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if i'm seeing the combs right the 2nd chick has a different type of comb than the 1st and 3rd chicks...can you get a shot of the combs of the three chicks please
My guess is boy, girl, girl, but it's still early for chick #2
my guess is cockerel cockerel pullet. 1st one has a bigger comb than the last one even though its not red yet, also its legs are thicker than the last one's to (i dont go by that to much though). 2nd by the wattles and comb, both have red in them already, also the thick legs. 3rd has the smallest comb and legs out of the 3 chicks