Personalized 1st Birthday Robot Long Sleeve T-Shirt. Happy 1st Birthday! Celebrate your baby's first birthday with this cute robot. Happy birthday 1-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