I have two Houdan chicks that are 6 1/2 weeks old. Little D is the first pic and Big D is the second (for the dots on their heads when they were tiny). At first I thought we had one of each sex because one feathered faster than the other. But now, I am not sure. They both have waddles and chest bump each other more often than the other chicks and they like to chase around the other chicks. We are keeping them both no matter what the sex, but I hate waiting to know.