Personalized 8th Birthday Unicorn 8 Year Old Girl Youth T-Shirt. Cute rainbow with sweet unicorn and quote saying Im 8 for a little girl turning eight years old. 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.