Every 7 kittens born, 6 are normal size and 1 special size!

[Crepe Myrtle]

Thanks for sharing, Fabao. It's very informative. You did this by each pair. Have you done an analysis based on how many kitten boxes you get in a day and check the sizes? I haven't really paid attention to the sizes. When I increased my stock, I got different sizes almost daily. I used to get about 80 kitten boxes per week. But now, I am down to 40 kitten boxes per week so the different sizes are more random. I really think it's random, depending on the size of your cattery. My two cents