Personalized Teddy Bear 1st Birthday Long Sleeve T-Shirt. IT'S MY 1ST BIRTHDAY teddy bear wearing a striped party hat with polka dot background, birthday gifts and balloon with the number one Long Sleeve T-Shirt - White. 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