Brief Answer:
Post partum exercise essential
Detailed Answer:
Thanks for asking on Health care magic.
Let me emphasize on the fact that use of such belts would not help in reducing the additional fat and what you actually need is post partum exercise which ideally should have begun right after delivery. The use of belt is like applying talcum powder on your face in order to look fair; in reality it will not make any difference to your complexion.
Visit a physical therapist and learn the exercises that should help. Thereafter, continue to exercise daily.
Regards