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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).
On a Major League baseball diamond, the bases are 90 feet apart. Major League Baseball's official rules identify the infield as a 90-foot square. College and high school baseball infields have the same dimensions as a Major League infield.