Sealy Baby Firm Rest Infant/Toddler Crib Mattress provides superior firmness for your baby with a 204 innerspring coil system and additional full perimeter border wire and anti-sag weight distribution bars. This durable crib mattress offers comfy cushioning and an antibacterial waterproof cover providing baby with the best sleep on a crib mattress. Two non-allergenic layers provide long-lasting durability and support. Measures 51.63 x 27.25 x 5.5 inches and fits both USA standard size cribs and toddler beds. Sealy proudly supports infants and toddlers with industry-leading crib mattresses known for safety, quality, comfort and premium support. Sealy is the leader in sleep technology and the best-selling crib mattress brand in North America. Passes all the latest ASTM tests for proper crib fit sizing, lock-stitched binding for safety and help educate caregivers about safe sleep and SIDS. Meets the Children’s Safe Products Act and Chemicals of High Concern to Children regulations as introduced by states like Washington and Vermont, among others. Pass CPSIA testing for lead and phthalates and each component is air quality tested for a healthier indoor environment. This mattress is GREENGUARD Gold Certified, tested for harmful chemical emissions at an independent laboratory. Sealy crib mattresses are made in the USA and backed with a 20-year warranty on all workmanship and materials. Use for infants and toddlers approximately 0-5 years. Tested for a snug fit inside standard cribs and toddler beds for years of use.