Personalized 3rd birthday CUPCAKE T-Shirt. Celebrate your little one's 3rd birthday in style with our adorable apparel collection featuring cute and happy designs perfect for a 3rd birthday party. 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.