that it's partly dependent on your skin type
me: no stretch marks with DS (put on nearly 3 stone)
my MIL (no relation): no stretch marks with 3 big babies ( 9/10lb +) and she's pretty small
we do have similar skin tone/type, so could it be related? If you didn't get any stretch marks, what type of skin do you have (will reveal mine after survey in true scientific fashion)