If you gain too much weight during pregnancy it can be hard to lose weight after you have your baby. During pregnancy, fat deposits can increase by more than 33 percent. Most women who gain the recommended amount of weight lose the extra weight in the birth process and in the weeks and months after birth. Breastfeeding also can help you lose extra weight by burning extra calories. Breastfeeding burns at least 500 calories each day. Find out more about what you should eat and avoid while breastfeeding.