J.W.
Hi D.,
I am a plastic surgeon in Mountain View (and a mom.) We do lots of tummy tucks on moms who notice that their bellies just don't ever seem to go back to normal after having babies, even with lots of sit-ups. This is because the muscles of your abdomen and your skin get stretched during pregnancy. Tummy tuck surgery can restore the tone to your abdomen. Email me if you have any other questions and best of luck.