Personalized Look Whoo's 1 T-Shirt. Whether you're planning a small family gathering or a big birthday party, our 1st Birthday Look Who's One Owl Birthday design is sure to delight guests of all ages. The design captures the joy and excitement of turning one year old, making it a perfect choice for a first birthday celebration. Let your baby girl shine on her special day with this charming and festive theme. 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.