Personalized Birthday Chick Number One Youth T-Shirt. Birthday chick in curly text with a yellow chick holding a large number one is a humorous gift design for your favorite chicks birthday. 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.