The most crucial aspect to consider when deciding on which baseball bats to buy is the laws of the game. Distinct ages and leagues have different regulations, and those restrictions dictate which bats you may use. BBCOR is the NFHS and NCAA baseball bat standard. USABat is utilized by little league groups for children aged 6 to 12. USSSA baseball bats are intended for younger players ages 7u to 14u. USA Slowpitch bats are required for softball leagues in the United States.