Im a smaller woman. Before getting pregnant I was around 113. I weighted about 141 on the day I went into labor. I got the sm/med and it fit just how I hoped! It wasn't super snug and gave me just the right amount of room I needed. This gown made it sooo much easier to breast feed while we had visitors and was great for when nurses came to do checks. It was beautifully designed with everything in mind that you go through for labor / postpartum.