So, our new girls are about 4.5 weeks old. Our older girls are 19-20 weeks old. Right now the younger girls spend their days in a pen outside in the chicken yard (covered of course). The big girls check them out. Occasionally the big girls charge the gate, but then get distracted and go after a fly. So, when can I let them all be together? We are building a walk in run. Should I wait and then put them all in the new run at the same time so it's new to them all? Will the girls be big enough at six weeks to get along? Just wondering.