Personalized Big Sis Girls Cute Sister Announcement Newborn Layette. Big sis Newborn Layette - White for a girl has colorful lettering that says BIG SIS with flowered border for a sister. 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