Update on Ameraucana chicks with question

[DomiHentrix]

Of my original Ameracauna chicks form the "Heritage" Farm one died and the other three are starting to lost most of their fluff and get feathers. Still they seem way behind for where a chick going on 4weeks should be.

Sorry they are in a brooder in my living room at the moment and the photos aren't the greatest, still shouldn't a chick on it's fourth week be fully feathered out? I am still concerned about these little guys. I still have them on chick starter 16% protein with corn a couple times a week as a treat.

Thanks for any thoughts/suggestions!

~Lara