Personalized 1st Birthday Cupcake Pink Polka Dots T-Shirt. Celebrate your little one's special milestone with our adorable 1st birthday outfits for girls and boys. Whether you're planning a birthday party or a photoshoot, our 1st birthday outfits are sure to make your baby stand out. 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.