I have only full sized chickens -- no bantams. Today, I found a teny, tiny egg in one of the nests. The egg is fully formed and the correct egg color for my brown egg layers. But it is only 1 and 1/8 inch long, and weighs only 3/8 of an ounce. I haven't cracked it open yet to see what is inside the perfectly formed little shell. I figure it was probably laid by one of my two pre-teens. I have two 18 week old Delaware pullets. Since all my other hens are older, more mature pullets or hens, I figure it must have been laid by one of the 18 week old Delawares.