Are there bat requirements for Little League? 

Per LittleLeague.org, as of January 1, 2018, the new USA Baseball Bat Standard was implemented. USABat Standard bats must be used in the Little League Major Baseball Division and below.

For more detailed information, please see LittleLeague.org   
for Bat Information and Bat Rules

In short, all bats in Little League must have the USA Bat logo in order to be considered legal, with the exception of T-Ball bats used only with approved T-Balls. In this case only, a USA Bat sticker can be applied to the bat to make it legal. There are no other exceptions.

Please also review the list of decertified bats and steer clear of these when purchasing your player's equipment.