Personalized 1st Birthday Puppy Pink Long Sleeve T-Shirt. I'm one! A cute pink puppy dog has a birthday hat and a cupcake with a 1 shaped candle. Happy 1st birthday to the one-year-old! 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