effective January 1, 2018. All national members of USA Baseball, including Little League, are encouraged to adopt this new standard. Little League-approved bats can be used through December 31, 2017, and our current bat regulations will be in effect until then. That includes the moratorium prohibiting the use of all 2 ¼ inch barrel baseball bats constructed with composite material in the barrel, unless approved. Visit LittleLeague.org for detailed information. Little League looks forward to working with USA Baseball, and will begin educating our local leagues, and the parents of our 2.1 million baseball players, preparing them for the important change coming in 2018.