I'm raising a Buff Orpington and BPR. I've had them for a week, and they are growing well . However, one problem I'm facing is socializing my chicks. Every time I put my hand very slowly into the brooder, they chirp louder and avoid it. When I moved them to a larger brooder, they were so frightened of me holding them. What can I do to let my chicks be more comfortable with me and other humans?