I have three 17 week old barred rocks and its very easy to tell the difference. The pullets have a very light pink waddle and comb and the roo has very dark red ones. The roo also has bigger waddle and comb.
I don't know I was visiting with a neighbor with all 1 and 2 year old chickens, and I was surprised at how tall a comb could be on a hen! I mean really surprised~
The first one looks exactly like my hen, same kind of comb and waddles. The other two look like roos.
You know this is kind of fun. I have been reading quite a number of post on this link and we should call this "Guess that chicken" and get points when we guess right. I know for some this is a big issue since it means whether or not you are going to keep your bird/s but sitting on this side it is kind of interesting.
Well I was going to say the first 2 pics are pullets and your BR is a roo...now I'm not so sure after looking at everyone else's comments! Let us know when you know for sure