I have had 2 children, and luckilly I dont have stretch marks on my tummy, but I have them at the top of 1 leg?? Mine have now gone a silvery colour over time, and all I do is put a bit of fake tan on them and they disappear, there are several creams on the market though that can help reduce (not get rid) the appearance of stretch marks though and that can be better.
Try searching on the net and checking out the reviews people have done, I dont buy anything unless I go to sites that have people review them, I usually go on
www.ciao.co.uk, but I am sure you will find lots of different sites.