Personalized Mouse Infant Romper. A great finder, a great helper, and a great friend. Mouse Infant Romper - White from "Dog and Mouse" by Michelle Nelson-Schmidt wants to help, not because she has to, but because she wants to. 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)