My 16 pullets have just begun laying their first eggs. I have gotten two double yolk eggs with in the first twelve eggs laid. Is this normal? Mind you, I am not complaining, they are extra tasty, just have not had these before with any my other chickens. I have black Astralorpes, Delawares, buff Orpingtons and gold Sexlinks. No rooster. So, are double yolks normal? Will they continue to lay double yolks? (I really hope so) Are certain breeds more likely to lay double yolks? Thanks for your input.