Personalized Big Sister Superhero Newborn Layette. Big Sister Superhero! The big sister looks out for her younger siblings, just like a true superhero should. Great Newborn Layette - White for any super 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