They won't normally start growing saddle feathers until that age. They're something that appears at chicken puberty at 12 weeks, like peach fuzz on a boy's chin.
This should help answer this question:
https://www.fresheggsdaily.com/2013/12/ameraucana-vs-araucana-vs-easter-egger.html
AMERAUCANAS
Ameraucanas are a pure breed that has been recognized by the APA (American Poultry Association) since 1984. They were most likely originally bred from South...