Personalized Cute First Birthday Monster 1 Year Old Long Sleeve T-Shirt. Babys 1st birthday design with balloon and monster on a 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