Thermage Vs Full or Mini Tummy Tuck for Post-pregnancy Tummy?

Thermage is excellent when the skin quality and elasticity is better.  In your particular case I think you will get the best results with a traditional "tummy tuck" at a qualified plastic surgeon.  Simply you have too much extra skin and this needs to be surgically removed.

Although Thermage may cause a small amount of skin tightening, it's hard to imagine that you will be satisfied with anything other than a full tummy-tuck.  Your issue is not simply skin laxity, but also fat and muscle separation as well.  If, on the other hand, you're completely against the concept of a tummy-tuck, then Thermage is really the only option that will at least give you a small amount of improvement.