Personalized Cute Turtle 6th Birthday Youth Long Sleeve T-Shirt. 6th birthday I'm 6 Youth Long Sleeve T-Shirt - White with happy smiling turtle with bow tie and party hat holding balloons and big red polka dot number six on his tummy. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)