I have 2 young d'Uccle chicks that I'm not sure the sex of. They are about 8-9 weeks old. There is one very obvious rooster and several very obvious pullets and then two that I'm unsure of. The for sure rooster, for reference on comb development: A for sure pullet (the ones I'm sure of have tiny flesh colored combs): One of the ones in question (on the right): Its comb is much smaller and more pink than the for sure rooster. And the other questionable cockerel, I have several pictures of it because he/she would not sit still: The comb on this one is fairly small, more like the pullets but it is much darker than any of the pullets. Your opinions would be much appreciated.
By eight weeks, it was really obvious which of my D'Uccles was a boy and which was a girl. I think the last one is a pullet.