Personalized Big Sister Superhero Infant Romper. Big Sister Superhero! The big sister looks out for her younger siblings, just like a true superhero should. Great Infant Romper - White for any super sis! Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)