First of all, we should know why the postpartum stomach can't disappear. The main reason is the separation of rectus abdominis, and the pregnant belly including the muscles inside are stretched. If it can't recover, it will pile up loosely in the abdomen. If you want to get rid of your stomach, you must take back your rectus abdominis. As you said, Kaigl prosthesis and self-exercise are the mainstream repair methods at present.