Gerber Sleep n Plays are a parents best friend! These soft footies are made with 100% cotton, a comfortable fabric that s perfectly breathable to prevent irritation against baby s delicate skin. We had this product independently certified with Standard 100 by Oeko-tex so that you don t have to worry about harmful substances in your baby s clothing. They re appropriate to use as newborn footie pajamas as they re made to comply with all safe sleep standards. Each Sleep n Play features a zipper down the front of the outfit to allow for easy and fast diaper changes. This zipper makes the baby sleeper incredibly easy to put on as well as to take off. Atop the zipper is a safety tab with a snap to keep the zipper held in place.