Personalized 1st Birthday Owl Youth T-Shirt. 1st birthday owl Youth T-Shirt - White. A cute owl holds a bright yellow balloon to celebrate the one year old's first birthday! 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.