Personalized Cute Turtle 6th Birthday Long Sleeve T-Shirt. 6th birthday I'm 6 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. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL