Personalized Choo Choo 3rd Birthday Youth T-Shirt. IT'S MY 3RD BIRTHDAY with colorful choo choo train with party hat, balloons, birthday gifts and big number 3 candle Youth T-Shirt - Heather. 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.