How fast you lose weight will depend on a number of factors, including amount of weight you gained during your pregnancy.
Most women will lose anywhere from 10-14 pounds within first 2 weeks of delivery. This weight may be attributed primarily to loss of excess fluid in body, baby's weight, placenta and amniotic fluid. Some women might lose a little bit less, and others might lose a little bit more.
As uterus shrinks back down to its normal size and your hormone levels continue to fall, you will lose weight. Most women gain at least 7 pounds of fat during pregnancy. This fat is meant to help women store energy while breastfeeding. How fast this weight comes off will depend on a number of factors including: genetics, your overall health, diet and exercise.
You should expect that it will take a little bit of time to lose weight you gained during pregnancy. It did after all take you nine months to put that weight on! Many women have successfully lost weight however, in just a few short months after a delivery.