Personalized 1st Birthday Owl T-Shirt. The Happy Owl Me design is ideal for parents looking for 1st birthday party ideas. The cute cartoon owl and vibrant colors will create a fun and festive atmosphere for your little girl's big day. This design is perfect for invitations, decorations, and thank you cards, making it easy to coordinate all aspects of the celebration. 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.