Dexbaby Safe Lift Universal Crib Wedge - White Dexbaby safe lift universal crib wedge is doctor-approved for providing baby with a safe and comfortable night's sleep. The gentle angle elevates baby's head for easier breathing and better digestion. This helps prevent acid reflux which is the backing up of acids into the esophagus and mouth. To install, simply place the safe lift under the sheet at the head of the crib or toddler bed and tuck in the bottom sheet. With the safe lift, both you and baby will rest easy.