I'm sitting in my wife's post-partem hospital room watching her breastfeed while I serf the net. I'm pondering how many calories are "burned" by breastfeeding. And, after a quick web search, I found the answer.
Breastfeeding burns an average of 500 calories a day with the typical range to be from 200 to 600 calories burned a day. It's estimated that the production of one ounce of breast milk burns 20 calories.
This is according to eHow.com: How Many Calories Do You Burn a Day Breastfeeding? eHow.com .