Okay thanksThe speed of feather growth can indicate the sex of the chick, but the tendency for slow-feathering in the male offspring has to be bred into them. I'm not sure if it's a reliable sexing method for buff Orpingtons. Honestly, I'd wait until you see more definite signs, like comb growth, before deciding if you have a little boy in your mix.
I get it every year with my chicks. This year, though, I'm kind of hoping my black frizzle Cochin bantam is a boy. 
They are 10 days old.
