Starting January 1, 2018, all baseball players will be required to follow the new USA Bat standards. In most cases, that means your player will need a new bat with the USA Stamp (shown below). Any solid one-piece wood barrel bats do not require the USA Baseball logo. This will apply to all the major youth leagues (Cal Ripken, Babe Ruth, Little League, etc)
Below are links to some helpful information on the bat standards, along with a listing of approved bats.
TBall Sticker Program: https://www.baberuthleague.org/…/USABat%20Tee%20Ball%20Stic…