Losing weight after pregnancy can be difficult as new moms juggle the demands of motherhood with their babies needs and sleep deprivation. The first step is to eat healthy and drink lots of water to help flush out the water weight you might still be carrying. At six weeks postpartum, you are ready to start exercising again. Movement helps the body heal and burns calories, plus babies usually sleep really well tucked into a gently rolling stroller. Breastfeeding also takes up to 500 extra calories a day and nursing mothers tend to lose pregnancy weight much faster. But the single best way to lose the pregnancy weight is to only gain a healthy amount. A women who is at a healthy weight before she becomes pregnant needs to gain only 25-35 pounds while pregnant.