A mommy makeover, normally consists of a tummy tuck and a breast surgery, either a breast augmentation or breast lift or breast reduction, to repair the changes that occurred after having children.  This is a question that many women ask.  While it is always better to lose any excess weight or be as close to your goal weight as possible, before a tummy tuck to maximize the results you will achieve, many women find that after their mommy makeover surgery that they are spurred on to losing their excess weight when they see the potential for their new body.
There is no real medical reason to loose weight before a mommy makeover (assuming your BMI is less than 30).  I utilize a no drain, 24 hour rapid recovery protocol so that you can back to your life and back to your workout routine quickly.  That way you will lose a step with your weight loss program if you are on one.