ll second the exercise thing; it will
help you lose weight
faster, plus with any significant weight
loss, it will
help the body to "work into" its new shape and size, minimizing stretch marks and saggy skin, especially if you just had a baby.
You don't say how old your baby is, but if you are nursing, expect that you will carry some "extra weight" to nurse your baby. I lost an extra 15 pounds right around the time that my son was 6 months old.