I hatched out four buff orpingtons this spring and thought I had 2 pullets and 2 cockerals for a long time, not much early comb development at all, but more on 2 of them, than the other two, but now I'm thinking I have four cockerals! I'd be very interested to know what you all think... the Light Sussex in the photo were much easier to tell, it helps that I have 2 boys and a girl for comparison and maybe the reason I can't tell is that the orpingtons are all the same sex. They are 18 weeks and 3 days old in this photo that I took yesterday.