Personalized 3rd Birthday Sail Boat Girls Youth Long Sleeve T-Shirt. 3rd Birthday pink sailboat Youth Long Sleeve T-Shirt - Heather has big number 3 on the sail for a nautical themed birthday party. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)