USA Baseball, in conjunction with all major Youth Baseball Organizations, including Babe Ruth, Cal Ripken and Little League, have enacted new bat standards for 2018 season. Any bat used this season must have the USABat logo so the league and our umpires know that it complies with the new standards.
Here's a further explanation by age group.
Our league sponsor, Dick's Sporting Goods, also has great information, as well as a video, on their website.