Girls, what kind of bandage is better to buy? What do you have? What w…

Girls, what kind of bandage is better to buy? What do you have? What would be before and after childbirth. The bandage like in the photo it goes by size...if I take, for example, my size now, the belly will still grow, so then it will be small for me? ??‍♀️ or how...I don't understand