Just over four weeks have passed since I was presented with my first egg. I suppose that the eggs were initially slightly smaller than one might have purchased from the supermarcardo but heyho that has to be expected from young birds. However over the last month the size of the eggs has increased, likewise that of the chickens, and yesterday one of the eggs was of goose egg proportions. I expect that it will turn out to be a double yolker. Another possibility is that there is an egg inside an egg. That would be much less likely but still a possibility.
I am beginning to suspect that one of the, "girls," is not laying. She is noticeably smaller than the others and her comb is not as large as that of her coop mates. Without the benefit of an infrared camera or a vegetable based marker I can't be totally sure.