Personalized Pink Superhero 2nd Birthday Youth T-Shirt. Happy 2nd birthday! Celebrate your baby's girl's second b-day with this cute I'm 2 pink superhero design. Happy Birthday two-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.