Personalized Monkey 1st Birthday 1 Year Old Girl Infant Romper. Cute Monkey Infant Romper - Pink for a 1st birthday has I'm One slogan. Cute gift idea for a one year old girl. 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)