Any ideas??

Ok so I have a big thighs and butt now even more since I had a baby which im happy with...when I lose weight its like that they shrink(I know they will some) and my big issue is my belly is still big and flabby..how do I keep my butt and thighs but lose the belly? I know sit ups and crunches (not much help wit all the flab on top at the moment) but I need to know is there anyway to lose just the belly and keep the bottom half. I do lots of cardio which is good but like I said it really trims them down not doing too much for the belly. Should I just keep up the cardio and when I lose more then try to tighten my belly but when I get down to 130ish my booty is just not how I like..hmmmm. Oh I have about 30lbs till I get to 130 but I know what I look like when there.....