Slow growing?

[rkapfen]

So a week and a half ago I got 4 chicks. 2 Ameraucanas, 1 silver laced Cochin, and 1 dark Brahma. The Ameraucanas were a couple days older and so just a bit bigger than than the other two but now they’re sooo much bigger. I thought the Brahma and Cochin would have over taken the other two since they’re supposed to be such a bigger breed of bird. Is this normal development? I feel like they haven’t grown much besides maybe feathering out on their wings a bit

 

[oldhenlikesdogs]

Bigger breeds tend to grow and feather slower in my experiences. It's hard to see any differences in individuals pictures.