Usually once you start worrying about stretch marks it is already to late. You have them. The way to prevent them is to understand how you get them. Simply, you grow... and then you blanch your skins of oil. People mostly blanch their skin by using soap. If you apply oil IN THE SHOWER while you are still wet you will not get stretch marks. If you soap off in the shower and then step out and towel dry before you apply oil... you can get stretch marks. It happens that fast. You have to apply oil before your skin dries.