Made to fit standard sized cribs this natural coir crib mattress from little green sheep offers a medium firm support and contains no chemicals ensuring only the most natural and safe sleeping surroundings for your baby suitable from birth to 12 months the deep core of this mattress is made from coconut coir natural coconut husk that is naturally fire resistant that is bound with a pure latex sap from the hevea tree this core acts like thousands of tiny springs evenly distributing baby