Personalized Coolest Trombone Teacher Newborn Layette. The world's coolest trombone teacher in snow capped text with a snowman playing a trombone is a funny design for teachers at birthdays and holidays. 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