Two Stages Of Firmness: Dual-stage crib mattress and baby mattress designed for growing babies. Firm infant side features 204 premium steel coils, reinforced border wire, EverEdge corner pillars, and anti-sag support system for a safe, supportive infant sleep surface. Comfort For Baby: Breathable cotton layer on the toddler side creates a softer sleep surface for growing children. This convertible crib mattress transitions from firm infant mattress to comfortable toddler mattress, supporting better sleep from newborn stage to toddler years. Waterproof Crib Mattress Protection: Waterproof lock-stitched binding and airflow pocket design help block leaks, spills, and diaper accidents. Protective cotton wrap fully encircles the baby mattress, creating a waterproof, stain-resistant crib mattress surface that’s easy to clean. Safety Tested Baby Mattress: GREENGUARD Gold Certified crib mattress tested for low chemical emissions to help support healthier indoor air quality. This baby crib mattress meets strict safety standards parents trust for infants and toddlers. Made In The USA Quality: Sealy crib mattress and toddler mattress proudly designed and manufactured in the USA with U.S. and imported materials. Durable baby mattress construction backed by a lifetime warranty for long-lasting crib and toddler bed use.