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As of 2008 the circumference of a regulation size baseball is between nine and nine and a quarter inches which converts to between about 7.3 cm and 7.5 cm in diameter according to the official rules of Major League Baseball (MLB).
Youth Baseball Bats. Youth Baseball Bats feature a 2 1/4 inch barrel diameter and are often lighter, with a length to weight ratio between -8 and -13. Youth bats are sometimes referred to as small barrel bats or Little League baseball bats, and are used by players that play in leagues that mandate a bat with a 2 1/4 inch barrel.