COOL, BREATHABLE SLEEP SURFACE: Natural cotton cover with airy channels helps this crib mattress circulate air around baby’s body for a cooler, more comfortable sleep environment, while a quiet, PVC-free waterproof barrier keeps the mattress dry and protected from overnight leaks for easier cleanup and added peace of mind for busy parents TWO-STAGE GROW-WITH-ME SUPPORT: Versatile 2-stage dual sided crib mattress design features a firmer infant side that helps support newborns during early development and a more comfortably cushioned side tailored for a full size toddler mattress, offering consistent, age-appropriate firmness from baby’s first nights through the toddler bed years while maintaining a snug 52" x 28" fit in standard full size cribs and toddler beds for confident use as your child grows HEALTHIER LOW-EMISSION SLEEP SPACE: GREENGUARD GOLD Certified for low chemical emissions, this non toxic crib mattress supports a healthier indoor environment for baby’s nursery, helping parents create a safer, more protected sleep space around their full size crib and toddler bed as their child grows LONG-LASTING POSTURE-SMART SUPPORT: Durable American steel coil support system in this full size crib mattress gently flexes to align with baby’s body for stable posture support, while reinforced steel edges with corner and side strength pillars help maintain an even, consistent sleep surface as your child transitions from infant crib mattress to toddler bed use over time TRUSTED USA-CRAFTED DURABILITY: Proudly made in the USA in a single specialized facility, this Sealy baby crib mattress is engineered by an expert crib mattress team for consistent quality and long-lasting performance, reinforcing Sealy’s reputation as America’s Most Trusted mattress brand and giving parents confidence they’ve chosen a reliable crib mattress and toddler bed mattress for years of safe, dependable use Pair with Sealy Crib Mattress Protector - For the perfect pair, complete your Sealy toddler bed mattress with a coordinating Sealy Crib Mattress Pad (available in 1-pack and 2-pack options)