Youth baseball leagues divide players according to age to ensure competitive balance and proper skill development. Boys and girls 9 years old typically play Atom I ball. Because of their young age, Atom I players compete using rules and field dimensions specifically tailored for their abilities and size, with all rules geared toward optimum safety.
Field
A standard baseball diamond features 90 feet between the bases and 60 feet, 6 inches from the pitching rubber to home plate. Atom I rules shrink the field dimensions to make the game enjoyable for young kids. Official Atom I diamonds place the bases 60 feet apart and the pitching rubber 40 feet from home plate. In Atom II divisions, which cater to slightly older children, both distances are 5 feet longer.
Game Length
Atom I baseball games adhere to strict time limits or innings limits, though the exact standards may change depending on the specific league. Most Atom I leagues play six or seven innings. However, games can end early if they exceed the allotted time limit, with two hours as the accepted standard.
Scoring
Atom I rules limit teams to scoring a maximum of five runs per inning. The rule prevents scores from getting out of hand when one team holds a distinct skill advantage over its opponent. Some leagues waive the runs limit in the final inning to avoid tie games.
Fielding
Atom I teams deploy 10 defenders in the field, with the extra fielder often lining up in the outfield. Atom I leagues don't use the infield fly rule, so all pop-ups are in play and must be caught. Atom I umpires will also call batters out on third strikes even if the catcher drops the ball.
Base Running
Atom I rules prohibit base stealing. Base runners must remain in contact with the base until the ball crosses home plate. If a runner leaves a base early, the umpire typically issues one warning per team. A second offense results in an automatic out.
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