Babies grow up fast, so make sure they have a mattress that will grow with them. Serta’s New Dawn Supreme Crib and Toddler Mattress has everything your child needs from birth till toddlerhood. A safe and innovative mattress, it features a firm thermo-bonded polyester fiber core, a naturally blended cotton cover with waterproof backing and unique infant and toddler sides that cater to each stage in their life. The infant side provides ideal firmness for newborns, while the toddler side is outfitted with a layer of Cool Twist gel memory foam. The Cool Twist gel memory foam supports increased airflow, which helps regulate your child’s sleeping temperature. Designed by the same brand that’s been leading the way in mattress innovation and technology for more than 80 years, Serta’s crib and toddler mattresses deliver the same quality craftsmanship and attention to detail as their adult mattresses. SertaNew Dawn Supreme Crib and Toddler Mattress: Extra-firm high-density thermo-bonded polyester fiber core Lightweight for easy changing Ultimate Edge Design: Firmer edges for extra support and squarecorners help with snug fit inside crib Naturally blended woven cotton cover has medical grade waterproofbacking Unique Infant and Toddler Sides: Infant side provides idealfirmness for newborns, Toddler offers additional Cool Twist Gel Memory Foamcomfort for reduced pressure points Cool Twist Gel Memory Foam: exclusive liquid gel-enhanced memoryfoam designed to increase airflow, which helps move heat away from Baby, alsoprovides enhanced cushioning to help reduce the pressure points GREENGUARD Gold certified: recognizes products with low chemicalemissions, contributing to healthier environments CertiPUR-US certified: Certified foam products are made withoutPBDE fire retardants, lead, mercury, formaldehyde, prohibited phthalates andother potentially harmful materials Meets or exceeds flammability, lead, phthalate and CPSIA testingand does not contain toxic fire retardants Limited 10-year warranty Dimensions: 52″ x 27.5″ x <6"