Personalized Big Sis Unicorn Girls Sister Announcement Newborn Layette. Cute little unicorn for announcing a new baby will join the family or the biggest sister in the family comes on a Newborn Layette - White. 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