Is there something wrong with this picture?

[cleoppa]

OK, so I have 6 hens, born March 1. If my calculations are correct, they turned the magical 20 weeks old on July 19. On July 31, at 21 1/2 weeks old, I got an egg. Ever since, I've gotten one or two eggs a day. On maybe August 2, I got two eggs in a day. Occasionally I get one, sometimes two. It seems fairly obvious to me (and maybe I'm crazy) that just two hens are laying. One egg is always a light brown and the other a richer brown.

I'm pretty sure my Buff Orpington is laying the light brown egg. I saw her on the nest one day with an egg under her, and from my searches, this is the color their eggs can be. Since my other chickens are not (from my research) supposed to lay brown eggs, I can only attribute the dark brown egg to my Australorp.

So... that leaves 3 Easter Eggers (or maybe Ameraucanas?) and a Brown Leghorn. As far as I know, they lay green, blue and white (Leghorn) eggs. But it's now nearly 22 1/2 weeks. Is something wrong here? I had thought the Leghorn, a more commercial breed, would be the first to lay.

It's been really hot... 100 +. Maybe that's why?
Do the Ameraucanas always lay the same color? For example, will Freida always lay blue and Ilsa always lay green?
I let them out of their pen around 1:00. I've actually found eggs in their nest, in the pen, after that time, but maybe another hen is laying in the yard? I've done a search, but maybe not thorough enough?
They're still on their baby food. I just poured the last of it into the feeder, but I won't put in the laying feed until they finish their current food. Could this make a difference?

Thanks!

 

[JerseyGiantfolk]

Different chickens have different laying times. My Leghorns didn't start laying till they were 6 months old. Pullets can start laying from 4 to 6 months, so you're pullets are on schedule. Just so you know.

 

[Den in Penn]

It could well be the Australorp. But it could be one of the EEs. You know a while back they were crossed with a brown egg layer. The brown egg gene pops up from time to time. A hens egg color stays the same. It might get lighter if she starts to run low on the pigment need and get lighter, but it stays the same color.