Serta's perfect slumber crib and toddler Mattress is the perfect choice for your baby's first mattress. Built with a firm fiber core made from recycled bottles, it delivers the perfect firmness level for newborns and toddlers while helping save over 300 bottles from the landfill-great for babies and great for the environment! Both sides of this mattress are topped with a vinyl waterproof cover that's Hypo allergic, so all you need to do is flip the mattress when it comes time for your baby to move from the crib to a toddler bed. Finished with square corners to help create a secure fit inside a crib or toddler bed, serta's perfect slumber dual sided recycled fiber core crib and toddler Mattress ensures a safe and comfy sleep for your baby, right from the start. All serta crib mattresses are GREENGUARD Gold Certified and meet the strictest standards offered by the GREENGUARD environmental Institute, which recognizes products with low chemical emissions, contributing to improved indoor air quality in your home.