
Well very simply, eat less, move more is what I've been told over and over again!
Easier said than done, I've never lost my post C-Section weight/jelly belly but I must say that when I did the low GI diet and basically cut down on complex carbs (bread, spuds, rice, pasta etc) the weight seemed to immediately come off my stomach area. This might be just specific to me as that's where I need to lose most of my weight, but maybe it's worth a shot....
Good luck....