Pre-Pregnancy Size X-Small: Dress - 0 to 4, Bust - 31 to 34 inches. Super soft fabric is gentle on baby's skin, machine washable and dryer safe. Seamless stitches to avoid uncomfortable chaffing. Fabric has a compression fit making your baby feel safe and secure. Breathable and moisture wicking material to keep you and your baby cool. Adheres to ASTM sling/carrier standards passing retention testing up to 45 pounds. Flattering short sleeve cuff. Support Belt Included.