Junior, Senior and Big League Baseball are youth baseball divisions of Little League Baseball that are considered more advanced and difficult than younger Little League divisions due to more advanced rules, including the ability to lead-off and steal as the pitcher breaks, along with longer base paths and greater pitching distance. Junior League also includes the use of bats with 2 5/8 inch barrels rather than the transitional 2 1/4 inch barrels of Little League. Junior League also allows the use of metal spikes in cleats in addition to the molded or plastic spikes used in Little League.
Junior League Baseball is for children aged 13 to 14 years old. Senior League Baseball is for children aged 14 to 16 years old. Big League Baseball is for children aged 15 to 18 years old.