Child support & safety: 5” thick crib and toddler mattress ensures a safe and comfortable night’s sleep with pediatric recommended firmness, and a durable, non-toxic fire barrier. Extra firm foam mattress is odorless, hypoallergenic, and chemical-free, perfect for newborn babies and toddlers. Certipur-us certified: certification verifies that the crib mattress foam is free of harmful emissions, and toxic chemicals. Dream catcher meets or exceeds all other safety standards for children’s mattresses. Waterproof, easy-to-clean cover: baby mattress features a lightweight, woven knit cover with waterproof backing to keep liquids out and easily wipe clean. Tear resistant, machine washable cover allows for easy sheet changes and ensures hygienic and safe sleeping surface. Immediate expansion: for optimal performance, unbox mattress immediately upon delivery. Rolled mattress requires 48 hours to fully expand, once laid flat. Fits standard full-size crib & toddler bed: safe, snug fit for standard size cribs and toddler beds. Unboxed dimensions: 52"l x 27.5"w x 5"h. Includes manufacturer limited lifetime warranty.