My olive eggers are about twenty one weeks old, and one (the frizzle in picture below) has been squatting for awhile, but they seem really small to lay eggs. They weigh a maximum of three pounds, and I think that's small, since I've only had barred rocks that were six pounds at this age. Is this normal? Do they get any bigger? I'm very OCD about my birds.
These are the birds on a perch they like by a window.


These are the birds on a perch they like by a window.