My broodies hatch within the flock, and take their chicks free ranging as soon as they come off the nest. That is, as soon as the last chick has hatched and dried off, or 3 days after the first one hatched, if one or more fails to hatch. Here's a broody encouraging 2-day olds to leave the coop and come down the ramp.
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The broody keeps them quite close to the coop initially, and frequently stops for them to rest and warm under her, and gradually increases the range day by day, while she introduces them to all the edibles they can forage and everything else they need to know.
As Ridgerunner said, the chicks may need assistance to get back in the nest for the first couple of days, especially if it involves climbing a ramp. This one was particularly well organised and got them all up on her own very quickly
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Having a broody and chicks is my favourite part of chicken-keeping. I hope you enjoy yours too.