2-Stage Dual Firmness Crib Mattress – Firm infant side with durable innerspring support and reinforced border wire plus a softer toddler side with soybean memory foam for pressure relief, proper posture support, and a grow-with-me baby mattress from newborn through toddler years Premium Supportive Baby Mattress Construction – Heavy-duty steel coils, layered comfort cushioning, and breathable cotton wrap create a firm yet comfortable sleep surface designed for infant safety, toddler comfort, and long-lasting durability without sagging or loss of support Waterproof Crib Mattress Cover – Lock-stitched seams and waterproof binding help prevent moisture, spills, and diaper leaks from penetrating the core while the wipe-clean surface supports a hygienic sleep environment and easy maintenance for busy parents Standard Size Crib And Toddler Bed Fit – Measures 52 x 28 inches to fit all standard full-size baby cribs and toddler bed frames with squared corners for a snug, secure fit that helps reduce gaps and creates a safe sleeping space for infants and growing toddlers Greenguard Gold Certified, Made In USA – Low chemical emission baby mattress built with safety-tested materials from a trusted family-owned brand since 1946, supporting cleaner indoor air quality, nursery safety, and reliable performance for everyday infant and toddler sleep