Personalized Tuba Nut Newborn Layette. An acorn nut holding a sousaphone is a humorous musical instrument gift design to tickle the funny bone of low brass musicians in concert, tuba choir and marching band. 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