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That is probably the most reliable method, but it poses a problem for city folks with children.
I have four straight run Delaware chicks, three and one half weeks old at present. I really NEED to figure out who is male and who is female, because legally we are not supposed to have any roosters. We actually have two roosters right now, but at least up to now, nobody has complained about it so we've gotten away with it. But we just cannot keep another rooster, or we're likely to have the authorities come down on us and make us get rid of ALL our roosters.
The problem with waiting until they crow is that -- by that time -- the family is attached to the birds. Right now, if I can sex these chicks, I can return the males to the lady who sold them to me without problem, because we are not too attached to the individual bird.
But we are already getting attached to them, and if we have to wait until they are 12 weeks plus, it is going to be very difficult to get rid of the cockerels by that point. And frankly, I'm not sure that the lady we got these birds from will be willing to take back a chick that age. The older the cockerel gets before the transfer, the more difficult it is to merge them into another flock.