I am not an expert! Now that has been said I am going off what my experience has been with my BLR Wyandottes. I just got into chickens so take it for what it is worth.....My chicks are 7 weeks old and some BIG changes are taking place. Some Wyandottes have a comb that is narrow...pretty much straight. Some have a comb that is narrow then wide then narrow again.....like a shield. The chickens with the shield seem to be turning out to be roosters. Now I don't know this "for a fact", however I am 90 percent sure...their wattles are larger and combs and wattles are more red. Look at the comb and you can get a pretty good idea. Hopefully someone with more experience will chime in and let me know if my hunch is correct. If nothing else it will bring your post up again.