can anyone tell the sex of these bobtail cochin bantam chicks?

[cdmadaio]

Hi yall. attached are photos of 4.5 week old bobtail cochin bantam chicks. i’ve never raised this breed before and was wondering if any of you guys could help me figure out their sex! they’re almost fully feathered and i’ve started to see a little comb+waddle development. any ideas are appreciated!

 

[Chicken_Obsesser]

The last one looks like a cockerel...