A 9 days ago I added 4 new girls to my flock. The 2 older ones (Black Copper Maran & Blue Maran) I was told were a little over a year old and were laying. The 2 younger ones (Speckled Sussex & Blue Maran) were about 13 weeks. The new older gals haven't started laying yet and I'm getting just a little nervous. I have 6 red Sex links and a Bantam Cochin that are 15.5 weeks that I started from chicks and 2 of them have started laying already. I know that stress can cause them to stop and it has been super hot here as well, so I'm hoping that with this week being cooler that they might start. I have done all that I can do to reduce the stress. I haven't let my little kids in to the coop, and have put up some burlap on the side of their enclosure that is next to the dogs. Our dogs don't really bothering them anyway. It also seems that they have figured out their new pecking order which was a surprise who came out on top. A close family friend also got 6 chickens from the same group to ad to his flock (of 26) and they have started laying already. He said that the farm is a good honest farm. I am pretty new at keeping chickens so I'm not sure if there is something that I am missing or that I might not be dong right. When should I really start to worry that they haven't started laying again?