Personalized 1st Birthday First Birthday Owl Youth T-Shirt. Our 1st birthday owl design apparel and gifts are ideal for commemorating this special milestone in your baby girl's life. The charming illustrations and vibrant colors make for a delightful addition to the celebration, creating lasting memories for the whole family. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.