Naturepedic's Classic Organic Crib Mattress is a must-have for the nursery. It's crafted with organic cotton fabric and fill that's free of flame retardants and potential allergensplus food-grade waterproofing for a more hygienic sleep environment. A durable, 144-coil steel innerspring system offers long-lasting support for baby's developing bones and muscles. The hypoallergenic mattress's unique dual-stage design offers a firm side for infants and a medium-firm side for toddlers, so it grows right alongside your little one. And its reinforced edges are an added safety bonus for rambunctious, bouncing toddlers.