I have a mixed flock mostly LF and a sebright roo, that are all 18 weeks. I am trying to add two eight week old bantam cochins to this group. They, especially the roo, will pick on the babies when they are all outside. Should I wait until they are bigger. I can keep them in separate coops and runs right next to each other if that would help. I just want to make sure they are not going to get hurt. Will it be harder to integrate when they are older?