Advice needed: these girls are 7 weeks old and we still keep them in the brooder but plan to move them out in the next few days. Last week we started to notice they all lose feathers, not a lot but maybe two or three a day. I am just concerned is losing feather at this age normal? They all eat drink and walk fine and we don't see bully behavior. We tried dust bath today but they were just not interested. It's our first time raising chickens and I'm just a naturally worried mama. Thank you all in advance.