Personalized Music Rock On Newborn Layette. Music rock On text with a happy dancing rock is a humorous music design. Fun gifts for back to school,marching band, birthdays, holidays and graduation. 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