Incline Wedge, elevates the baby, helps the breathing and digestion, and has back sleeping positioners. Inside & Outside Air Vents, mesh panels for improved air flow & a vented sturdy plastic shell. Built-In Nightlight, larger size for checking and calming with a removable, slide on design. Foam Mattress, Waterproof mattress with removable, machine washable sheet. Sleep Positioners, Mesh covered positioners to help baby stay in proper sleeping position.