they happen so deep down in the third layer of skin that most products don't get that deep any ways. like @lizibear84 said they are genetic. just keep lotion on try not to itch and also try not to take really hot showers because the heat draws out the moisture. I only have a few on my hips but they started way before I was pregnant and before I found out I was I used vitamin e oil on them (they were purple) they were almost gone than I got pregnant and I gave up putting anything but lotion on just because I know they will come back (every girl in my family to get pregnant has gotten horrible stretch marks)

Stretch marks are genetic and have a lot to do with the natural elasticity in your skin. There's no true way to prevent them, unfortunately. But keeping hydrated and your skin moisturized will help lessen any that you do get, if you get any at all. I'm 40+1 (ugh) and don't have a single stretch mark, I just use either Mama Bee's belly butter or lubriderm for extremely dry skin, depending on how dry I feel after my shower

i shower in dove body wash nothing else & use coco butter i dont have one stretch mark & hes due in 4 days.

I've been using coco butter!!!

I used everything and got them until now

I use Palmers and so far it's worked good for me. I'm 31 weeks with no stretch marks.

Bio oil or palmers are amazing !