Personalized This will be the Best Birthday Ever Infant Romper. While all birthdays are worth celebrating, this one will be the best ever! This will be the Best Birthday Ever Infant Romper - Raspberry, featuring Mouse from the children's book "Dog and Mouse" my 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)