Among my last batch of chicks, I have a bantam Dark Brahma, 2 bantam Cochins, and one regular sized Cochin. They are all five weeks old now. The regular sized Cochin and one of the bantam Cochins are almost fully feathered except for the head whereas the Dark Brahma and the other Cochin bantam only have partial wings grown in. They are all from a hatchery and have been fed the same thing. Is this slow feathering pattern mean they are probably males? I know that is frequently the case but I was not sure about these breeds. Thanks for the help!