In my experience with my ex wife after she had our son, the best way to get rid of the stretch marks was to use cocoa butter over a long period of time. I found that the use of that and a product with Retin-A in it would eliminate or substantially lessen the appearance of stretch marks over an extended period of time.
I am expecting my baby soon in few months and have these horrible looking stretch marks but I was advised to apply cocoa butter which would be a natural home remedy while the doctor prescribed a cream which was readily available in any pharmacy store without prescription that can be applied 2-3 times per day to get rid of these marks.
You won't ever completely get rid of them unfortunately, but you can lessen the affects somewhat by moisturising the skin regularly, especially whilst pregnant.