Personalized 3rd Birthday Train 3 Year Old Girl T-Shirt. 3rd Birthday T-Shirt - White choo choo train design has number 3 and flowers and bows for a girl turning three years old. 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.