Personalized North Pole 1st Birthday Infant Romper. Infant Romper - Black for a little elf's 1st birthday with a polka dotted number one and red and white striped North Pole sign. Perfect for Santa's helper on his or her Christmas birthday. 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)