I got this bra at the end of pregnancy after a friend recommended it. I have a short maternity leave and knew that I would be pumping when returning for work. I was a 32-34B prior to pregnancy. At the end of pregnancy I was 36B. I ordered a medium and it fit perfectly. I ended up needing to use the bra in the hospital because my baby was having trouble latching and I had to start pumping milk for her. It was a lifesaver being able to pump hands free. I have pretty much used it every day since then and have actually ended up ordering 2 additional bras. Even with milk supply in and engorgement, the medium still fits very well.