I have had two BRs turn out to be males and both of them had the definite barring (big white stripes with a few small black stripes) on the wing feathers from a very young age. The girl had mostly black with a few whitish spots on the wings. I can't really say 100% sure yours are boys yet though, I would wait until about 5 weeks because that is when my boys combs turned red and started growing huge.