Personalized Big Sis Girls Whale Fish Sister Announcement Youth T-Shirt. Cute big sis Youth T-Shirt - Vintage Royal Blue with whales to announce your daughter will have a new little brother or sister in the family 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.