Mother Nature will help
Don't be shocked that after you give birth, you're still going to look at least six months pregnant. It's going to take time for your body and your belly to recover from the last nine months. From the moment your baby is born, your belly, much like a balloon, will begin to deflate. It will take about four weeks for your uterus to contract back to its normal size. All the cells in your body that swelled during pregnancy will begin releasing their fluids (think urine, sweat and vaginal secretions). And the extra fat you put on to nourish the baby will start burning off (especially if you're nursing and exercising).
Many doctors, nurses and, of course, lactation consultants believe that nursing will help you lose weight and tighten your abdominal area. You burn calories when your body makes breast milk and when your baby nurses. It also helps your uterus contract.
Exercise: Don't underestimate basic crunches
It's probably been a while since you've done a crunch (er, nine, maybe more months), so start slow and don't push too hard. Begin with pelvic tilts and simple abdominal contractions. Lie down on your back with your knees bent, feet on the floor. Slowly tighten your abs and tilt your pelvis toward your head. Tighten the pelvic floor as you do this.
Use a stability ball
An exercise ball is another great tool for tummy exercises after pregnancy. Ball crunches work like regular crunches, but you'll be adding the element of balance, which makes your moves a bit more challenging.
Pilates or yoga
Try yoga or Pilates, both of which place an emphasis on a strong core. You'll have that pre-baby belly back in no time!