Personalized Monster Truck 3rd Birthday Infant Romper. I'm Three! A red monster truck drives over the words. Great third birthday gift for your 3 year old who loves trucks. 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)