Personalized Baseball 4th Birthday Long Sleeve T-Shirt. Baseball league sports style 4th birthday boy with baseball bats. Cute sports themed 4-year-old b-day party gifts. Happy Birthday four-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