Personalized Race Car 4th Birthday Newborn Layette. Race car 4th birthday Newborn Layette - White with red race car, checkered flags and big number 4. Side of car says BIRTHDAY CHAMP. 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