They seem small

[johndeerematt]

Maybe I'm delusional, but my hens all seem kinda small for 20 weeks. My roosters weigh about six pounds and look normal sized, but the hens look small. Here's a picture of them, the five gallon feeder bucket being a reference.

 

[Veer67]

I think that your chickens look normal sized, roosters are bigger than hens.

 

[ChickFuentes]

Don't worry
It's all good.
And also some breeds are smaller than others, like my Rhode Island Reds look ALOT bigger than my Black Astralops, and they're the same age!
That's just how they look.
Astralops are more slim while RIR's are more buffed out.

So no need to worry