Abstract: An infant crib safety mattress is disclosed comprising a mattress body having a sleeping area defined by a largely flat surface, the sleeping area bounded by an upsloping border region that is angled upwards at a defined angle to prevent a child from wedging against or entangling with the crib rails, while also eliminating the need for crib bumper pads. The transition between the sleeping area and the sloping border is an upward angle less than perpendicular, eliminating any sharp transitions or locations where an infant may become wedged. The internal structure of the mattress includes a uniform filler material or a coil-spring system, as desired by the user.