Personalized This will be the Best Birthday Ever Youth T-Shirt. While all birthdays are worth celebrating, this one will be the best ever! This will be the Best Birthday Ever Youth T-Shirt - White, featuring Mouse from the children's book "Dog and Mouse" my Michelle Nelson-Schmidt. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.