Your baby will rest easy on this super lightweight crib mattress from Lullaby Earth. It packs in all the key features of a crib mattress while weighing in at a mere six pounds, making changing sheets a breeze. Made from food-grade polyethelyne, this crib mattress is non-toxic, hypoallergenic and 100percent recyclable. Naturally waterproof, it is easy to clean and resistant to bacteria buildup. Size: Toddler Standard Crib. Gender: unisex.