Personalized Race Car 1st Birthday Infant Romper. Race Car with the number 1 on it for a baby boy 1st Birthday is fun and colorful and comes on a party Infant Romper - Black gift. art c. Ne Metzger 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)