Personalized Hippo 2nd Birthday Youth T-Shirt. Hippo 2nd Birthday! I mean Happy 2nd Birthday! A cute, smiling hippo wearing a birthday hat sits in front of a birthday cake ready to blow out the candles. Cute second birthday gift for the two 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.