You can lotion your belly but that helps more with itching and dry skin. From all the recent articles out, there's no prevention sadly. They do fade though.
I heard that u can't totally prevent stretch marks as they're hereditary. But there r a couple things u could do to delay them from forming quickly by not gaining weight so quickly and moisturizing ur skin. I ended up getting stretch marks on my breasts while I was pregnant and a bit on my hips during my 8th month of pregnancy with my first. The have faded a lot since, but u can still see them. Oh well...I hope not to get more with this pregnancy...
My Dr told me the only way to prevent stretch marks is to be born to a mother who did not get them and she be born by a grandmother who had not had them either. I thought it was a little rude but funny.
Make coco butter or shea butter your best friend