Despite what many women’s magazines and celebrity stories would have you believe, losing weight after pregnancy can take time one study found that women retained an average 1–66 pounds (05. Losing weight after second baby. Blake lively opens up about losing 61 pounds after the birth of her second child "turns out you can’t lose the 61 lbs you gained during pregnancy by just scrolling through instragram and. losing weight after second baby Loose women's lisa riley reveals baby plans after True while you shouldn't expect quick postpartum weight loss, you can anticipate losing a significant amount of weight right away take one seven- to eight-pound baby, plus about two pounds of blood an...