Simmons Kids Quiet Nights Dual Sided Crib and Toddler Mattress helps deliver a safer, heathier and better nights sleep for your newborn, infant or toddler. Its firm and comfortable core is made from over 300 recycled water bottles, making it the best choice for your baby, and the environment. The waterproof and hypoallergenic cover keeps the mattress clean and cozy for many years. Simply flip the mattress when it comes time for your baby to move from the crib to a toddler bedits specifically designed to fit any standard full-size crib and toddler bed.