Personalized Race Car 1st Birthday Infant Romper. Race car 1st birthday Infant Romper - White with red race car, checkered flags and big number 1. Side of car says BIRTHDAY CHAMP. 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)