Personalized Worlds Best Trombone Player Newborn Layette. Cool trombone player gift has Worlds Best trombone saying in two tone sports style design and comes on this fun trombone Newborn Layette - White gift for your trombonist in marching band or jazz groups. 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