Personalized Baseball 3rd Birthday T-Shirt. Baseball league sports style 3rd birthday boy with baseball bats. Cute sports themed 3-year-old b-day party toddler gifts. Happy Birthday three-year-old! Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.