My Chicks are 3 weeks old today. I know they still need the heat lamp, my concern is that they are going to keep getting bigger, and I'm not sure if keeping them inside until they are fully feathered ( 6 weeks or so I'm guessing?) is going to be the best idea!! I live in Maine, so it can still get quite cool at night, but I am wondering if I could move them out with the heat lamp at 4 or 5 weeks?? any thoughts??