Thought I'd share some more pictures of my mystery girl/boy- we've taken to calling her/him "roo" or "ro-ro" for short I honestly hope it's not a rooster, as this is the least brave of my babies- when I'm cleaning the run in the morning, this girl/guy always seems to get separated from the rest of the flock and come running home in a big kerfuffle and hide out with me while I'm raking- definitely not going to be the flock protector if it does end up being a rooster.
None of the babies have started laying yet (come ON already little girls!!), so the verdict's still out. They have to be somewhere between 22 and 24 weeks at this point. I'm sort of thinking girl though, seems like maybe the tail is filling in some.
From the front:
With another for comparison (s/he is on the RIGHT):
Still a pullet. Wyandotte roosters have such a different feather pattern and by 20 weeks you would be seeing definite differences. The tail feathers would be black by now. The combs would also be a dead giveaway by now too. GLW hens are going to outweigh your BR by a good 2# so don't let her size get in the way.
Wyandottes are going to be slower to start laying being a DP breed. My one GLW from this year started at 25 weeks. She had a nice read comb and waddle for about 2 weeks prior. Yours don't appear to have much color yet.