Finding a crib mattress that offers natural, flame-resistant materials used to be almost impossible. But thankfully, today’s modern and eco-conscious crib mattresses come with the same amount of flammability safety precautions, but without the use of toxic flame retardants. This really is a win-win for families who are concerned about their baby’s health, but who appreciate the safety assurance of fire-resistant materials. Some of the options on our list that offer such protection include the Naturepedic Organic Cotton Crib Mattress and the Colgate Eco Classica III. All of these crib mattresses pass the federal guidelines for flammability standards.