I would keep an eye on those combs. They seem to be getting hen feathers but the combs are pretty pink. If they start to raise up in the next week or so, you've got a load of roosters.
I have 5 BLRW that were hatched the very same day as yours. Maybe in a little bit, I'll go take a couple pictures of mine so we can compare together. I think I have at least 2-3 cockerels. Their combs are a little bigger and redder.
I have noticed that BLRW girls tend to have pink combs early...mine all did. I feared they were all boys.
This turned into this
And this
turned into this
So going by that, I would say girls...but it would be easier to tell with a body shot from the side, as from this angle, it is hard to see the size of their feet/legs.
Ok, I just went out and took some pics of my BLRW that are the exact some age. I think I have 3 cockerels and two pullets. I'm pulling it mainly from the wattles. The boys' combs are slightly bigger, and I also see a difference in their feathers already. Real experts, if I'm totally wrong, please set me straight!
See how you can already see wattles forming? Plus, look at the feathers on the shoulders, as compared to the feathers on the wing. I think this is a cockerel. (I think the bottom left chick is a pullet)
I think this one is a girl because the comb is smaller, as is the wattles. The feathers around the neck/shoulder seems different too.
cockerel on the left, pullet kind of in the middle.
Here's the whole group of five (plus two lavender ameraucanas that are 3 or so days older).