Born in a double tier coop where the nesting area is on top and a run area underneath & is located in the corner of my 8 x10 chicken coop. The ramp is long gone. But it was the safest place for my broody to be for 21 days because the run area is secure. The peeps have been in the top part for the last 4 days where her nest was but are now outside the coop on the bottom tier that is basically just a pen underneath. The hen has food ,water, grass, and some shavings on the bottom run area. How did the peeps get from the top tier without a ramp? It's about a foot drop. How long should I keep the hen & her peeps from joining the main flock? (20 adults) They free range all day in a fenced acre of land that doesn't get mowed. They only return to the chicken coop to lay eggs and to roost at night. I don't want anything to happen to the baby chicks. I mean, GOSH, they are so small.