The Lullaby Ocean Disc features a soft, comfortable playing surface combined with a padded interior shell which provides a gentle whooshing, womb-like sound soft enough to soothe a baby to sleep. Designed specifically for use with premature babies and the First Sounds: Rhythm, Breath & Lullaby Program. Research demonstrating its benefits has been published in Pediatrics, The Official Journal of the American Academy of Pediatrics, and featured on the front page of The New York Times. Available in size: 16" x 2.5"