Shark Birthday design. This 6th Birthday Shirt for 6 year old kids features shark, white shark and the number six. It makes a great 6th birthday outfit for every shark, sharks lover. Happy birthday. This 6th birthday t-shirt for boys, girls and kids is the eye-catcher at your kids birthday party. Adapt the shark theme to the birthday banner, invitation card and decoration in general. Lightweight, Classic fit, Double-needle sleeve and bottom hem