I use my kitchen scale on my eggs. My leghorn hybrid has been laying for two weeks. To the naked eye the eggs look all the same pullet size, between pee wee and small. I weigh each egg out of curiousity because I am still excited to bring an egg in the house. They are getting a tiny bit bigger as the days go on. They started at 1.3 oz and are now 1.5 oz. I figure at this rate it will take a couple of months to get to a large size egg with her.