A cotton crib sheet not only looks adorable, but it also helps you track your baby's development when used with the Nanit app and monitor (sold separately). Place your baby on the sheet and the camera automatically reads the custom-designed pattern to estimate baby's measurements without any sensors, electronics or radars. 27.5" x 52" Watch Them Grow feature automatically creates a montage of baby's growth for you to save and share Fits standard-size crib mattresses 100% cotton Machine wash, tumble dry Imported