Serta Perfect Sleep Crib Wedge helps safely elevate baby's head and torso. Ideal for babies with acid reflux or congestion. Fits all cribs and toddler beds. Easy to wipe clean. Features counting sleep embossed design. It comes with a Portable Sound Soother that helps relax baby anywhere. The vibration gives your baby the comfort of movement even when standing still. Includes white noise, lullaby, and heart beat sounds for additional soothing.