Personalized Music Rocks Dark Products Newborn Layette. Music Rocks. These three musical rocks with a trombone, violin and guitar are shaking to the music. A humorous gift design for music lovers at birthdays, holidays and back to school. 100% combed ringspun cotton 5.8 ounce 1×1 baby rib sleeper. 3/8" flatlock binding at envelope neck and cuffs. Back sleeve flap to protect hands. Elastic opening at bottom. Infant: 0-3 Months