Personalized Mouse Toddler T-Shirt. A great finder, a great helper, and a great friend. Mouse Toddler T-Shirt - Light Blue from "Dog and Mouse" by Michelle Nelson-Schmidt wants to help, not because she has to, but because she wants to. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.