Thanks. They are from TSC, so, one of four hatcheries. One is a blue laced red Wyandotte and the other is a splash laced red Wyandotte.Cute chicks!
Chicks grow at different rates. Could be they don't have the same parents/are a different line or strain. Where did they come from?
As long as it's eating/drinking, pooping and active, I wouldn't worry too much.