Im a little new to chicken keeping and ive had my chicks since they were 2 days old, they are now 5 weeks. 4 have white feathers and one of them I looked at her up close today and it looks like her neck feathers are turning a buff or like tan color. Just on her neck feathers though are these the hackles coming in or what she only 5 weeks, I'm confused on her coloring now as well cause I thought she's to young to have hackles come in.