T-ball bats are the first bats most ballplayers will use, in all likelihood. Therefore, it's important to pick the right bat, despite the fact that they're relatively inexpensive, small, and light. It's never too early to learn the proper mechanics of a swing, and swinging the right bat is crucial to learning. Like any youth or senior league bat, t-ball bats vary in their drop weight. But since they're designed for a younger, smaller hitter, they tend to have a higher drop weight, such as -10 to -13. Swinging a bat that's too long or heavy could cause a hitter to form bad habits or poor mechanics at the plate.
Keep in mind, the purpose of t-ball is primarily instructional (after having fun, of course), so t-ball bats tend to be made with inexpensive, lesser-quality materials. With options from trusted brands like Louisville Slugger, Easton, Franklin, DeMarini, and Rawlings, it's easy to find the right length and weight.