Help! I have 2 RI Reds, 2 Black Australorps and 2 Barred Rocks. I don't know how old they were when i got them. I was told 16 weeks, then 12 weeks, but now I'm suspicious they may have been as young as 8 weeks old. a couple squat when petted , others don't. Some have bright red crowns and waddles- others don't. Anyone have any thoughts on times they may begin to lay???? Thanks!!!!!