Personalized Big Sister Superhero Newborn Layette. I'm the big sister, and I'm a superhero! Cool gift for any super big sis! 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