Class A 100% cotton, 0 formaldehyde, no fluorescent agent, anti-static.Comfortable and skin-friendly, all-purpose one-piece clothing for the four seasons, baby can be nipped and gnawing fabrics after careful study to care for baby's growth, comfortable home clothing for baby, boneless sewing, no grinding of baby's skin, double care of baby's skin.The bow tie design for access control, the open crotch is convenient for wearing, taking off and changing diapers, and the cuffs and feet are open for the baby to move his hands and feet