Personalized Ducky 3rd Birthday Long Sleeve T-Shirt. Quack, quack! Cute little duck floating on a pond with balloons says I'M 3, IT'S MY BIRTHDAY Long Sleeve T-Shirt - White for a boy or girl's ducky 3rd birthday. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL