I am a bit worried. My bantams are 24 weeks and have not layed any eggs. My full size chickens are older than them and have not layed yet. When they were very young they would sleep in the nesting boxes, so I put curtains up and they stayed out. I've taken the curtains down and they sleep in front of the boxes, but haven't ventured inside yet. There are no eggs yet. Should I be concerned? This isn't just one, but 8!