Personalized Cordelia and Birds Believe in Yourself Infant Romper. If you believe in yourself, you can achieve whatever you set your mind to. Cordelia and Birds Believe in Yourself Infant Romper - White, from the children's book "Cordelia" by Michelle Nelson-Schmidt. 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)