While each of our mini-cribs comes with a standard mattress, we've partnered with Lullaby Earth to create a certified non-toxic mattress custom-made for our cribs that comes with a waterproof, breathable cover for extra peace of mind.  The design consists of a certified non-toxic mattress wrapped in a removable, washable, breathable cover with a waterproof backing. It is non-toxic, hygienic, convenient and supportive—everything you’re looking for in a safer crib mattress.