Full term pregnancy weight breakdown: 4 pounds for increased fluid volume 4 pounds blood volume 2 pounds amniotic fluid 2 pounds breast tissue  2 pounds uterus  1.5 lbs for placenta  ~5 lbs for maternal storage of fat, protein, and other nutrients 7.5 lbs for baby! 90% of that comes off naturally in a few months, but they tell you not to judge your body for 18 months because skin stretches and darkens and all of that fun stuff.