Depending on how you define "new" I can be included. I started this program after giving up on my body returning to normal on its own after baby #3 (also my last). He was a bit over a year at the time, but I've been at it for almost a year (only lifting twice a week, I just completed the whole program - it took me 9 months, which I found appropriate

). I have seen definite improvement and have even gotten a 2 piece bathing suit to show off all my new muscles this summer. My stomach is back to being firm and muscular, although the skin is still a little wrinkly and it is not as flat as it used to be. I got my flat tummy back after baby's 1 and 2, so I think I just pushed things too far going for a third (my babies were BIG and I am small and I think my stomach and innards just finally gave up on me

). Still, lots of improvement and I feel really good about myself.
I had three c-sections and would definitely recommend waiting for a few months if that is your situation. After my first my stomach muscles didn't feel right for several months after the 6 week "all clear".
Good luck! This is a great program.