Personalized Hippo 3rd Birthday Youth T-Shirt. A cute little hippo wearing a birthday hat with a number 3 on it, sitting by a birthday cake. Adorable gift for your three year old. 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.