Personalized 5th Birthday Penguin Youth T-Shirt. 5th Birthday Youth T-Shirt - Red party celebration gift has cute penguin in a polka dot hat with the number 5 on its tummy. 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.