I started with size s, now I‘m down to xs four weeks after delivery. Seems to work!
I had a C section on my first child and used the Belly Bandit CSection corset and loved it. I purchased the Belly Bandit BFF thinking it would be more suitable after a natural birth. Unfortunately I don’t find it as good as the corset. It bunches and curls making it super uncomfortable. I have to adjust it a lot during the day.
I have a a small waist and large hips so this didn’t fit well at all. It kept riding up and bunching up so unable to use it. However the customer service I received in resolving the problem and getting a refund was very good.
For best results, I would advise that you wear compression garments (post-natal vest and leggings). I am a size 14 post birth, but I bought a x-small and the extender. It works well but it's very tight and srunches around the sides. A small would work well with the extender and a medium would work well on its own. I also used the belly wrap immediately after giving birth.
I had very big expectations from the product but unfortunately there are problems: I have to keep take it off and rearrange it because it keeps lifting up and doesn’t stay as firm as I feel it should and unfortunately is bending in the middle therefore I constantly have to keep pulling it down. The size chart is accurate.