Pow! Zap! Kabam! With bold colors and a super sized number, this Superhero First Birthday design is an awesome way to celebrate your hero's upcoming Big Day. All of our personalized first birthday tshirts are made of super soft, thick cotton and are digitally printed with premium inks. This super design can be printed on a short sleeve tshirt, long sleeve tshirt, baseball tshirt or personalized baby onesie.