Personalized Puppy 3rd Birthday Long Sleeve T-Shirt. I'm three cute puppy. Celebrate your toddler's third birthday with this adorable little doggy. Happy 3rd b-day 3-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