We always recommend you check your crib or cot’s mattress doesn't sag and lies flat with no tears or holes. It’s also important to keep it clean and dry for your baby’s comfort, with frequent mattress changes for each baby to ensure overall safety. If your Next2Me bedside cot needs a new mattress, it’s advised to use the Chicco original and official replacement. The official Chicco Next2Me Mattress replacement fits all Chicco Next2Me models (except for Next2Me Forever and Next2Me Twins). Simply remove the wooden panel from your existing Chicco Next2Me mattress and insert into the new replacement mattress. Ensure the Velcro is sealed once changed and place the new mattress back into the crib. The mattress cover is made of resistant fabric and is completely removable and washable. The padding can also be hand washed in cold water for easy cleaning. It’s a good night’s sleep guaranteed.