These are my 5 week old Buff Orpington chicks. The one in the foreground has always been a bit bigger and always had a redder comb and waddle skin. When I got them, I had assumed one was slightly older than the other. I really hope it is a hen, I have been making sure to handle them alot and they will sleep in my lap like they are in the picture. I'd hate to have to give it away but I am not allowed any roosters. I have no other observations other than the pink, larger comb. You can see how much smaller and yellow the other's comb is. Time will tell, but what do you think?