I see so many people on here continually hatching... How are you all integrating the chicks with each other and at what ages? I have seen the articles about adding birds to a current flock, but what about Newborns with 4 week olds? 2 week olds with 5 weeks olds etc? You must have a way or you must have many brooders... I have some chicks hatching this weekend and my last hatch will be 4 weeks old. When can I integrate these 2 hatches with each other? Tips?