I'm preoccupied with my weight.  Not enough to be detrimental to my health, but more than enough to classify me as technically vain.  Anxious to get a handle on how long it's going to take the weight to come off post pregnancy, I devised the following mathematical equation.  Who knows if it's accurate, actually pretty excited to find out.

You can use your own figures, but for the sake of this exercise let's work with a woman who has gained 35 lbs in 9 months of pregnancy and gave birth to a 7 lb baby.  The equation assumes that the mom isn't working out, but is breastfeeding and is taking in roughly the same amount of calories she was when pregnant.

Total Pounds Gained:  35 lbs

Subtract the Following:
-  Baby:  7 lbs
-  Placenta:  2 lbs
-  Amniotic Fluid:  2 lbs
-  Increased Blood Volume:  4 lbs
-  Uterine Enlargement:  2 lbs
-  Fluid in Maternal Tissue:  4 lbs
-  Breast Enlargement:  1 lb

This leaves 13 lbs of fat that has accumulated over pregnancy. 

Breastfeeding converts about 400 calories of stored energy into milk a day.
There are 3500 calories in a pound.
Therefore, breastfeeding converts a pound of fat into milk every 8.75 days.
At this rate it would take about 3.4 months for breastfeeding to burn the remaining 13 lbs of fat.

Taaadaaa!