Personalized 3rd Birthday 3 Year Old alphabet Infant Romper. 3rd Birthday Infant Romper - White has A B C look who's three third birthday quote and stacked alphabet blocks for a boy or girl turning 3 years 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)