Are you breastfeeding? That generally helps take the weight off more quickly, you also lose a few lbs after you stop.
After I had my daughter I had a lot of weight to lose. I had gained about 60lbs during my pregnancy, and let me tell you even my stretch marks had stretch marks!
I started doing cardio for 40 mins, 5 times/week and about 100 crunches/day. I lost the last few lbs after about a year. I weigh less now than I did when I was pregnant, but my body doesn't quite look the same.