Personalized Unicorn 4th Birthday Youth T-Shirt. A cute unicorn with wings, a colorful mane and tail, and wearing a gold crown stands on a rainbow by a golden 4. Cute 4th birthday gift. 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.