I see a Lav boy and the others are girls. As far as I can tell, anyway.
I have had very good success going by the tail and feathering. Boys take forever to get tails and little pullets feather out quicker all over.
I've had a few who are ambiguous, but they're pretty consistent.
ETA I think one of the blacks may be a boy- the one with less tail.
ETA What the heck was I drinking that day? I think the first Lav is a maybe, and the first black is a maybe...the rest look roo-ish as all get-out if they're that young. I'm a ditz sometimes.