Personalized 3rd Birthday Sail Boat Girls Youth T-Shirt. 3rd Birthday pink sailboat Youth T-Shirt - Black has big number 3 on the sail for a nautical themed birthday party. 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.