Personalized Ducky 3rd Birthday Youth T-Shirt. Quack, quack! Cute little duck floating on a pond with balloons says I'M 3, IT'S MY BIRTHDAY Youth T-Shirt - White for a boy or girl's ducky 3rd birthday. 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.