These girls have gorgeous feathering! Glad you hung onto themI feel compelled to offer some words of wisdom… I recently joined this sight and the forums related to BLRWs because I love them, bought them as sexed chicks, and because I had no experience with the breed or raising dat old baby chicks. I asked the same question I keep seeing on this feed as well as other feeds related to young BLRWs. Boy or Girl? I was lucky to have a ton of response to this very question when they were a week old, month old, 2 and 3 months old… Unfortunately and fortunately, most responses I received were wrong. DON'T TRUST PEOPLE (LOL)!!! They don't mean to misinform you, but they will trying to help. Only one person on here was consistently right. Resist the urge to ask until they are 4 months old or start waking you up in the morning once the boys start doing their thing.
I would have re-homed a few girls thinking they were boys if i listened to everyone i asked on this site.
Also, don't think your chicks are blue or black or lack the blue color until they are 5-6 months old. Some are late to the party. Some of ours didn't show the blue color until they were six months old.
Take what you want from this.
Have a great day.
3 of these 4 young lades would have been given away if I listened. I had 1 boy out of 8 sexed chicks. We started seeing the difference at 3-4 months.

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The picture of the older bird does look like a blue Ameraucana or Easter Egger. There is a lot of variation if the color "blue", but yours looks like in-between color. Some look very dark...almost black, and some light, but not light enough to be called lavender. The chick does look like my BLRW chicks did and I have a variety of appearances to my youngsters. A few looked very much like the finished product from the time they started feathering out. Some still look like a mix right now, but I know the one matrure pullet I already have did not have good lacing until she got her adult feathers in at about 6 month old.