From: Breastfeeding.com:
Breastfeeding burns calories. Over 600 calories a day for breastfeeding women who don't supplement with formula. 600 calories! That's like getting two hours of aerobic exercise each day. A study published in the Journal of American Dietician association shows breastfeeding melting off inches around your hips and buttocks. The reference is below.
Summary:
Mothers who breastfed exclusively or partially had significantly larger reductions in hip circumference and were less above their prepregnancy weights at 1 month postpartum than mothers who fed formula exclusively.
Author: Kramer, F.
Title: Breastfeeding reduces maternal lower body fat.
Published in: Am Diet assoc 1993
From: Breastfeeding.com:
Summary: Mothers who breastfed exclusively or partially had significantly larger reductions in hip circumference and were less above their prepregnancy weights at 1 month postpartum than mothers who fed formula exclusively. Author: Kramer, F. Title: Breastfeeding reduces maternal lower body fat. Published in: Am Diet assoc 1993