Personalized 1st Birthday Owl Long Sleeve T-Shirt. Whether you're planning a small family gathering or a big birthday party, this 1st Birthday Look Who's One Owl Birthday design is sure to delight your guests. The design is ideal for a baby girl's first birthday, with its cheerful colors and charming owl character. Make your little one's milestone birthday even more special with this sweet and festive theme. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL