Determining sex of 6 week barred rock chicks

[annieo12]

Hi! I’m new here (this is my first post) and I’m needing help determining if my 5 barred rock chicks are pullets or cockerels. To me, they all look the same. They turn 6 weeks tomorrow. Any help/comment would be appreciated! Thank you!

 

[BlessedmamaAELE]

Will probably need individual photos to help you to be able to tell you exactly. But the photo with 3 chickens. The one in the middle looks like a cockerel. By the comb development and color. It’s more defined than the others. But again hard to tell without individual
Photos. One with head turned where you are looking at profile view looks
Like a pullet