I breastfed both kids -- my firstborn for nearly seven months and my second for 13 months. Why the difference? I had this fantasy that if I stopped breastfeeding I'd lose those last stubborn pounds. So I switched my first bundle of joy to the bottle and watched the pounds simply stay there. It wasn't until I joined Weight Watchers and started eating less and moving more that the pounds came off.

According to this study in the American Journal of Epidemiology cited in Women's Health, I should have been sleeping more. Women who slept five hours a night were three times as likely to retain 11 post-pregnancy pounds as women who slumbered seven heavenly hours each night. Sleep-deprived cells releasing more appetite-stimulating hormones or stress hormones may be the culprit.

Granted, switching to the bottle did allow my husband to help with middle-of-the-night feedings -- our first did not sleep through the night until 11 months. But I do have a bit of regret I stopped breastfeeding so early in hopes of instantly losing the weight. It just didn't work. Diet and exercise ... and maybe more sleep over time did.