Personalized 3rd Birthday Penguin gift Youth Long Sleeve T-Shirt. 3rd Birthday Penguin Youth Long Sleeve T-Shirt - White has happy Penguin bird wearing a number 3 and a colorful party hat. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)