The Delta Children Peaceful Dreams crib and toddler mattress has everything your baby needs for a healthy, refreshing sleep every night. 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. Both sides of this mattress are topped with a vinyl waterproof cover that is hypoallergic, 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. It's also finished with square corners to help create a secure fit inside a crib or toddler bed.