Personalized Robot 3rd Birthday Infant Romper. Little robot 3rd birthday I'M THREE Infant Romper - White with cute robot, stars and red planet with the number 3. 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)