Personalized 1st Birthday Polka Dots Cupcake Youth T-Shirt. Our 1st birthday outfit for boys is designed with comfort and style in mind. Crafted with soft fabrics and cute details, this outfit is ideal for your little man's first birthday celebration. Whether he's crawling around or posing for pictures, he'll look absolutely charming in this outfit. 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.