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I have three 12 week old's right now, and they are only about half the size of my six month olds, from my past experience, I'm guessing they'll be much closer in size in 3 to 4 weeks, they grow so fast.
You may try freeranging all but one or two of your calmest hens, and let the chicks loose in the coop with them for a few hours. Then gradually add in another hen or 2.