Personalized Sun Stick Girl Little Sister Infant Romper. Little sister Infant Romper - White with a funny, little cartoon stick figure baby in diapers wearing a pink T-shirt with a sun on the front. She says I'M THE LITTLE SISTER. 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)