Hey there! So i have had my ladies for almost a week now. they went from 2.5-3 weeks to 3.5-4 weeks old. Their brooder is a medium sized dog kennel with a heat lamp. But when i went to let them out this morning (they walk around the yard while i clean up their bedding and change their food and water) one of them flew out of the brooder as soon as i opened it up. Now thats the first time she's done that, but im worried that their brooder is too small for them now. but they arent big enough to go into their coop yet. So how small is too small for five girls at 4 weeks old?