We have 5 full grown laying hens and just adopted 10 baby chicks from a teacher that hatched eggs as a classroom project. The chicks are now 3 weeks old. What is the right age to integrate the babies into the coop with the full grown hens and what is the best way to do this? We bought our laying hens grown just a few months ago, so we are rookies at starting from chicks. Any advice would be greatly appreciated!