Hi! I have 6 roughly 12 week old heritage birds. I am very scared to mix them in with the other hens because they still seem too small. They have all their grown up feathers and just need to grow a bit more, but they are not even close to the size of the big hens. They have been in the same coop as the older girls, just closed off for the past 2 weeks. I notice my hens looking up at the little ones every once and a while when I put them to bed. I want to mix them together, but I don't want them to get pecked to bits! Please help!