Baby chickens are called chicks, biddies, cockerels, pullets and broilers. Chick and biddy are interchangeable terms for any baby chicken, while cockerel and pullet refer to specific genders. Broilers bred for meat are harvested between nine and 12 weeks of age.
Cockerels and young roosters are male chickens under the age of one. Pullets are female chickens under the age of one. Once chickens are a year old, the females are called hens and the males are called old roosters or cocks. Layers are hens that are kept for laying eggs, and brood hens are layers that sit on and hatch their own eggs.