Hen or Roo? Help sexing my four chickens. Pictures at various ages

[kath12]

Do you have a picture of the RIR as a chick? I still think pullet, but could be a late developing cockerel.

 

[LaurenRitz]

Still say pullet. Sometimes the boys will have a white "cap" at the top of the wing. Not always, but I've never seen a chick with that white cap that turned out to be a pullet.