I dont know what im doing wrong?

I had a baby about 6 months ago. I am the same weight i was when i was 9 months pregnant about to give birth. I have tried every diet...atkins, WW, slimfast, acai berry,green tea,hydroxycut, and i am not on HCG drops and i eat lean meat and veggies and water and i jog 2 miles a day on the treadmill and i have not lost 1 single pound....what do you other moms do to lose weight? please i need help!!