Mine are almost 4 weeks old. I removed a temp wall in the brooder because they were getting too big for the portion that I had walled off for them and now they are also all piled on top of each other in the corner. I also changed the food container to a hanging feeder and put some larger roosts in there. Too much change in one time it seems. They act freaked out but they will have to get used to it. 
Disadvantage of making the brooder bigger is that they can now get out of my reach. So transporting them to their playpen tomorrow will be a challenge. I need longer arms!

Disadvantage of making the brooder bigger is that they can now get out of my reach. So transporting them to their playpen tomorrow will be a challenge. I need longer arms!