Personalized Dinosaur 1st Birthday Infant Romper. A dinosaur apatosaurus (or brontosaurus to the grandparents) stands tall over the 1 for the first birthday. Happy birthday to the one year old! 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)