A sling that’s as comfortable as your favorite knit top? Absolutely. The Serene Sling by Balboa Baby Unlike other slings that bind and confine, the serene sling is soft and flexible so it hugs your baby without being too tight. Wear it everyday around the house, out shopping or on a long trip,it's always handy. The deep pocket style keeps baby comfy and cozy so you can stay active and your baby can stay close. Sizing Information: Size T-Shirt Size Bust Measurement XS P-XS up to 33" up to 84 cm S/M S-M 33"-48" 84-97 cm M/L M-L 37"-43" 97-109 cm X/L XL 43"-47" 109-119 cm If you are falling in two size categories, here are the reasons to choose a smaller size. - You would like your baby to sit higher on your body. - You have narrow shoulders - You have a short torso - You wear a smaller cup size - You will mostly be wearing lightweight clothing (tank tops, t-shirts, etc.) with the sling - You carry your weight in the lower half of your body If you are falling in two size categories, here are the reasons to choose a larger size. - You would like your sling to fit slightly looser. - You have broad shoulders. - You have a long torso - You wear a larger cup size - You will mostly be wearing heavier clothing (sweaters,sweatshirts, etc) with the sling - You carry your weight in the upper half of your body.