I am a new Chicken Mama-have had my 9 girls since last Spring. I would like to get some new chicks this spring, but was wondering several things: First, how do you keep the babies separated from the big girls? I have one coop and run. I could separate the little ones (after they feather out), in the run, but then they would have to be carried into the coop and caged to protect them from the big girls. Second, how do you keep new Chickens from eating the layer feed that the big girls are on? I understand it is damaging to the younger hens kidneys. Third, how old do the new girls have to be to be introduced to the older girls??? Thanks in advance for your expertise.