Personalized Cute Turtle 6th Birthday Youth T-Shirt. 6th birthday I'm 6 Youth 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. 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.