Chick size question

[NC Mame]

I have four buff Orpington and two black sex-links. They are three weeks old. They were all the same size when we got the . Now, The BO chicks are at least twice the size of the BSL. Is this normal?

Thank you!

 

[nuthatched]

Chicks are individuals, they develop at different rates.

 

[ChickNanny13]

Also breed differences

 

[rosemarythyme]

You could also post photos if you're not sure you have the right breeds. Orps do grow up to be larger birds generally. But I only mention that because there's been quite a few instances of people accidentally buying meat birds, which grow much faster than layers.