What is the best way to get rid of my stretchmarkss?!!?

I am nine months pregnant and have been very careful to gain the right amount of weight at a steady pace... 3 lbs the first three months and a lb a week after that its been a total of 30 lbs, I've used Palmer's lotion and almond oil everyday and avoided scratching my stomach. My fiance' noticed a couple weeks ago stretchmarks beneath my navel.... a lot of them! Please help.