Sealy Baby Posturepedic crib mattresses provide one-of-a-kind targeted support for infants and toddlers. The Sealy Baby Posturepedic Grow 2-Stage Crib Mattress is a grow-with-me design. It is engineered with the Posturepedic Advanced Zone Support System on both the infant side and the toddler side, unlike any other crib mattress available. The infant side features extra support in the center zone of the mattress, perfect for new-borns that need a firm, flat sleeping surface. This is especially important in the center where babies are placed in their cribs for safety. The toddler side features comfort layers plus head and foot supports with 10 strength pillars and a secure steel edge system. Layers of cotton and support padding encircle the mattress. A cotton fabric cover is breathable on the baby's skin while the waterproof barrier helps to prevent liquids from seeping inside. Easy-clean cover with mild soap and water. Non-toxic materials. All Sealy crib mattresses are GREENGUARD GOLD Certified for air quality.