Personalized Best Mom Fish Youth T-Shirt. Youth T-Shirt - White with cute and colorful school of fish says WORLD'S BEST MOM. Mother fish is leading the way. Perfect gift for Mother's Day. 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.