cockrel?

First one Second one I just recently got chickens for the first time. 4 of them are barred rocks and they are now 7 weeks old. I can’t tell if these two are roosters or hens, any help would be appreciated.

I have two Speckled Sussex chicks they I picked them up on the same day. given that they may be a day or two different in age its definitely not a week or so different. the first three images are of Houdini Or Houdina though I'm believing more and more that it's a cockerel. there is even some...