As discussed in liposuction, there are a lot of things out there that say they will help your abdomen. The problem here is that liposuction, Cool Sculpt, Aqua Lipo, etc. all need good skin to give a result you will be happy with. Abdominal skin doesn’t have the elasticity of back and thigh skin so if your skin has been stretched out by pregnancy or weight gain/loss, you probably need something that will tighten the skin.
Abdominoplasty or tummy tuck cuts out the extra skin and fat as well as tightening the abdominal muscle.
The procedure does leave scars, but they are fairly well hidden. The recovery is longer (probably 1-2 weeks), and the risks (bleeding, infection, blood clots) are higher than with liposuction.
You can spend almost as much money on these “non-invasive” procedures and be left with an abdomen that looks the same or sometimes worse.
In the end, it takes a consult with a plastic surgeon to truly know your options.