Personalized 3rd Bird Day T-Shirt. IT'S MY BIRD-DAY 3rd birthday T-Shirt - White with a cute little blue bird, yellow and red bird house, butterflies, clouds and number 3. 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.