Personalized Dog and Mouse Infant Romper. This unlikely pair found their very best friends in each other. From the children's book "Dog and Mouse" by Michelle Nelson-Schmidt comes Dog and Mouse Infant Romper - Light Blue. 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)