When I was pregnant with both of my two boys, each pregnancy I would rub normal Baby oil over my belly area. I didn't get any strtch marks on my stomach. I also made sure that I didn't get too big and drank a lot of pepsi max and coffee. I had smaller babies both healthy but I would do it all again.
I have to say.. i very much disapprove of this.. You should really.. really.. never repeat what you said.. and don't have more kids unless you are going to put them first!