Little League Baseball
Little League Baseball is an international organization that has broad name recognition anywhere you go. In order to have its participants represent its brand, Little League has specific rules requiring all players to wear a patch on their uniform and designating the position on which it should be worn. Little League officials strictly enforce this rule, and players not wearing patches may not participate.
The Little League patch must be sewn on or ironed on to the upper left sleeve or left breast area on the uniform. Little League actually has different patches for its different divisions, so the patch must also match the division in which the team plays.
Pony Baseball is another youth organization that has a worldwide reach. It plays under a completely different set of rules than Little League, but like Little League, Pony likes to market its brand on the uniforms of its players. The Pony Baseball rule book does not have a specific entry for regular-season patches, but tournament teams for all of its all-star and postseason teams are required to wear patches that bear the Pony Baseball tournament team emblem on the right sleeve.
American Legion Baseball
American Legion Baseball is a competitive summer baseball program for high school and first-year college players. Run with teams that represent American Legion posts in each of the 50 states, the national rules do require that players were a patch either on the left sleeve or left chest of the uniform shirt. In American Legion ball, the coaches and managers also wear full baseball uniforms, and they must also have a patch or they will be asked to leave the field.
Babe Ruth League
Babe Ruth League Baseball is a combination of Cal Ripken Baseball for kids 12 and under and Babe Ruth for kids 13 through 18. The organization also requires that players wear a shoulder patch setting them apart as Babe Ruth League participants. There is also an option to wear an insignia on the back of the baseball cap instead of on the uniform sleeve that will satisfy the rule.