I started using this 3 weeks after I had my son. I was XS or S pre-pregnancy, denim size 25 for most brands. I gained 10-15lb during pregnancy and Small fit me perfectly.

My abdomen hurt so much after my son's birth and I was scared to use this, that's why I waited a few weeks. When I finally put this on, the pain was still there but this corset surprisingly didn't hurt my stomach and it was actually pretty comfortable. I also found it easier to sit, stand or walk with this on, and it didn't make me nauseous or anything while eating. After about 3 weeks, I could see my saggy skin was shrinking. (I think it took me longer than some of other reviewers because I didn't start using it immediately after I gave birth to my son.)

Another good thing was that it made my sticking-out tummy less noticeable when I was so conscious about how I looked after having a baby. I was only wearing oversized t-shirts, sweatshirts, hoodies and cardigans that hid the shape of my belly, but with this corset on I was able to wear clothes that were a little more fitted.