I have a group of pullets that will be 5 months old at the end of March (no eggs yet). I would like to hatch some chicks this summer. I know I need to wait until I have eggs of uniform shape and size. We sell eggs to my husband's colleagues, so it won't be difficult to get reports on the yolks. Besides the physical characteristics of the eggs, is there a rule of thumb for age to start attempting to hatch? These are Easter Eggers, in my experience they are laying pretty regularly by six months. A friend who is experienced at hatching eggs will be taking these eggs until I am fully set up next spring. So, my lack of experience won't be a limiting factor.