Buy a size bigger! I bought this in my 8th month of pregnancy and it was very large. But by the time I delivered it fit great and you don't want anything tight when you're in labor. I received a lot of compliments from all of the nurses and doctors and it is great to be complemented when you're in labor and in pain and feeling not so attractive. Loved the matching pillow. One disappointment was that the top button was broken and I didn't realize it until the hospital.