This onesie, the Birdie Bean Brielle birdie twirl, is designed for your little one. It's great for all-day wear at home or out and about. The fabric is a blend of 95% bamboo viscose and 5% spandex. It runs true to size, but size up if between sizes. Models are wearing 3 - 6M and 6 - 12M. Use snap closures for easy diaper changes and shoulder snaps for easy dressing over baby's head. Tagless for added comfort. Machine wash cold with mild detergent, inside-out, fully snapped, with like colors and other bamboo items for best results. Do not bleach, use color catcher sheets, and avoid additives and brighteners.