SAFETY FIRST, ALWAYS: This mattress is Greenguard Gold Certified to ensure optimum health, safety and peace of mind; meets/exceeds all safety standards set by CPSC/ASTM and passes all flammability (16 CFR 1632/1633) phthalate, lead and toxicity tests. General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state. The expansion time of the mattress will vary as per the surrounding. IDEAL SUPPORT: The mattress features a fiber core that offers a firm foundation and excellent support for your baby.