I also had a hatchery "RIR" brood 2 clutches for me. Hasn't gone broody since 2013 however 

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to cute, yeah hers still get under her too when the winds blowing cold or climb up on her back, Thinking of pulling her out and putting her back with the flock but then I got one in the brooding box and that wouldn't be pretty as the BR don't share at all
I use a heating pad instead of the lamp.. they get the heat and dark nights https://www.backyardchickens.com/t/956958/mama-heating-pad-in-the-brooder-picture-heavy-updateFunny cute. My bantam never stop being mom, the kids just start drifting away, but the still roost next to them. If my shipped chicks ever get here I might return some chicks to my hatching mom. She has two eggs that have potential but I hear no peeping or scratching so they are probably no good and I will dispose of them after today.
My chicks are all thriving including the "dead" one who shows no sign of damage. There are 9.
I use a heat lamp, and since reading some think they make the chicks crazy from 24 hour lights, I'm watching them, but every time I look in they are peacefully sleeping or quietly pecking around. I do like that I can control their heat and I think it helped the chilled one recover. I am trying to not be biased, because I like the control a heat lamp gives me.
I am wanting to see if I notice anything as far as behavior, of course it's only day 2, they seem calm and happy.I use a heating pad instead of the lamp.. they get the heat and dark nights https://www.backyardchickens.com/t/956958/mama-heating-pad-in-the-brooder-picture-heavy-update