Ours are 3.5 weeks and are getting up to their brooder walls 3+foot. They are in the garage but I'm afraid if they get out they won't be able to get back in and it still gets a little nippy at night outside of the brooder. It's really only one or 2 that are that brave which makes it worse because if they get stuck out of the brooder, I don't know how they would keep warm
I can understand that. Our brooder is only about a foot high, so it's not a big deal when they get out 'cause they can very easily get back in. Maybe you could put something next to the brooder that they can use to jump on to get back in? That way you could worry less.
