I have a different set up. My babies stay with their mothers, with the rest of the entire flock, their entire lives. I have plenty of space, and I've NEVER seen a chicken KILL another chicken. Some babies do get stepped on, but I've come to take those losses as the price of doing business. Like I said, I have a huge coop, and they free range. I say, if the babies are old enough to run away, and have plenty of room to do so, you'll be fine. I've raised hundreds of chicks this way. It works for me. I think plenty of room is key. Most of my hens don't even care, except of course when the day is over and it's roosting time. All of the young ones just huddle together in the corner on the floor, away from the roosts. I have gentle breeds also, black giants and australorps with one golden comet and white leghorn thrown in. Maybe 60 birds or so right now with more due to hatch in a couple of weeks.