It's a BOY.........or it could be a girl. I KNOW without a doubt it's one or the other. We've been trying to figure out what ours are, too. The SLW's have distinctly different combs. The Brahmas not so much . We've taken the ones that have the longer tail feathers and compared them to the ones without tails and the combs look the same. We just can't really tell at this point.
Ok, seriously though, Look at all the other 5, and then her. She's the only one I am like 90% sure looks like a female. The other 2 are iffy. But the first 3 are DEFINITELY BOYS! No doubt there

I've tried looking at the tails too, but I actually can't see any differences. Now the chick #4, which I think is a female, her feathering is smoother than all the others. Don't know if it's just my imagination or if it's really there. I guess I'll find out in the coming weeks.