Personalized Big Sister Comic Book Newborn Layette. Big Sister! Pow! Cool! A big sister is like a superhero, watching out for her little siblings. Cute gift for any 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