Personalized Mouse: Be A Friend Infant Romper. Mouse: Be A Friend Infant Romper - Heather, from "Dog and Mouse" by Michelle Nelson-Schmidt shows us that being a friend is the best thing you can be. 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)