Sexing Yokohamas

 This years crop includes what should be a white Yokahama picked out by my son. It was the only one left  Its a little bit older chick, I would say about two weeks as it is getting some long feathers already. Any suggestions as to what to look for aside from comb as it is getting older? Do they feather differently or at a different rate? I have never had one before and this chick has such long feathers already! I would hate for it to a rooster since my 3 yr old picked it out. We dont keep roosters and his last chick he picked out and last turkey ended up being boys. I should have learned my lesson and let him select from the pullets! Thanks!

edited to add- You know, I am not sure what varieties of yokohamas are out there. I was told this should be one, and it appears it is but there is a chance it is something else. Also, is there a way to tell if they will be white or red shouldered?

I will get one.

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I sure hope so! She (it) actually came from our local feed store. We had just picked up some chicks  from a  breeder and stopped to get a few supplies. My daughter decided she had to have a little banty and since it is her birthday, I caved. I saw this chick in a pen with a bunch of RIR and Wyandottes. I could tell it was neither due to the obvious and they said they did have some yokohamas in from a local breeder and that must be the only one left. Since my daughter got one, my son had to have one and this is his pick. I have never had one, and it could be something else, although with that long of feathers already, Im not sure what else it could even be! What ever it is, is very docile and actually likes to be held so I guess we will see!