Bio oil. I'm 9 months with no stretch marks. You need to apply it twice daily.
I use plamers coco butter, not one stretch mark yet and i'm 32 weeks :)
Mederma stretch mark cream it works wonders! Its pricy but worth it! I used bio oil and that n they are no longer noticable. You also have to be consistent n keep up with putting it 2-3 times a day :)