It's not generally too difficult - just wait until at least 4 weeks or so, and if you see chicks with larger/redder combs, they likely are cockerels. They start to differentiate pretty early on.

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Those black ones look actually like my marans and d'Uccle. I don't want to say or not, where did you get them?Does the black mottled still resemble a penguin at that age? does my little black and white appear to be pure for a 6 week old?
these ones are not full grown they are oh most a year old she is laying but she stoppedI think they are cute! So... I know the chance of this being the breed they are crossed from is slim, but how about Pyncheon, or Watermaal? The crest behind the comb looks the same to me, and the size would be about right. I've only ever seen pictures of them though, so I don't know....they are really rare.
More than likely a porcelain with red leakage. that's why many breeders won't mix the lavenders in with the reg millies. But it is a very handsome bird.I do see that..well we will have to see how they turn out. What color is the roo in the middle with both brown and lav?