What kind of mattress does the BABYBJÖRN cradle have?

The mattress in BABYBJÖRN Cradle complies with existing mattress standards and has been developed in consultation with paediatricians. A thin mattress is safer than a thicker one. Please note: Only use the mattress that comes with this product. There is also an organic cotton sheet, tailored to fit the mattress, which can be bought as an accessory: the BABYBJÖRN Fitted Sheet for Cradle.