I mail ordered chicks of various breeds (all female) and received them last March. They are not laying yet, but should be within the next 6 weeks or so. I had one chick that is so small, she is less than half the size of the other one I have of the same breed. They are Silver Laced Wyandottes. I also had one chick (Delaware) that became lame. Neither of these problems were apparent when they first arrived. I have another flock one year older than these (all White Rocks). Right now they are kept separate, but when the young ones begin to lay, I plan to combine them all. Any suggestions on the best way to go about this?