Personalized This Kid is 3 Birthday Youth T-Shirt. This kid is three! Celebrate your child's third b-day with this cute thumbs up 3 design. Happy Birthday 3-year-old! 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.