I have 4 chicks that are currently 10 weeks old. Chicken math kicked in and I just order 4 more than will be ready for pick up on May 27th. So question is when can they all be together? I kept my first 4 in the house for 9 weeks while we finished building our coop. So they just moved in a few days ago. I assume I will need to keep the babies in my house under a heat lamp for the first 4-6 weeks? When they move out how do I introduce them? Do I do it gradually under supervised visits or just allow them to meet and move in same day? By the time these chicks will be 6 weeks old the older ones will be 18 weeks old.