In my wife's case, she managed to lose 55 pounds after having our last child because she and a buddy religiously worked at it using Weight Watchers. Even afterwards however, there was still the remaining weight from the extra skin around her tummy that could only be removed by surgery (abdominoplasty). She doesn't count that little extra weight loss however. She only counts the 55 pounds lost doing Weight Watchers.
I'm reading a couple of blogs right now that deal with losing your "baby" weight. I'll post links to them here in the near future.