Personalized Bulldozer 1st Birthday Infant Romper. 1st Birthday Bulldozer Infant Romper - White has number 1 and room to add a personalized name for your one year old on their birthday party day. 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)