Keep in mind that each patient is unique and your results may vary.
This is a 36 year old woman who had two C-Sections and was frustrated with the skin that hung over her scar. She told me that the original scar healed nicely, but that the second time around things didn't go as well. The skin fold seen in the "before" photo was visible through many of today's fashions and gym clothes. She found it very embarrassing.
Her story made sense because the skin itself had not healed poorly, but the layers of tissue didn't seem to have been lined up properly at the time of C-Section closure. In fairness, I have closed a few of those myself and it is quite challenging to do well when all the tissues have been stretched out from the pregnancy.
In any case, by the time she arrived at my office for revision of the scar her youngest child was 2 years old. We completely removed the old scar and all of the overhanging skin in an effort to get her flat tummy back.
The "after" photo is only 3 months later, so the scar is still visible. I expect the scar to continue to fade and she should end up with a fine line across her lower tummy by about 1 year after scar revision.