I have got 3 RIR hens(they are right at 1 yr old) and one of them is laying an egg about the size of a quarter. She has laid two of them in the past 2 weeks with normal size eggs in between. The other 2 are laying normal size eggs daily. I am feeding Tucker Millings 22% Super layer pellet with treats of crickets and cabbage once a week. There has been no trauma or excitement that I know of. Why do ya'll think this is happening?