Little League Baseball rules for tournament play are somewhat different from regular season playing rules.  From the their "Green Book" (aka 2013 Baseball Official Regulations and Playing Rules), Little League makes the Tournament Rules and Guidelines section of the book available in PDF.  Also, the Little League Umpires website provides this one page summary of key rule differences between regular season and tournaments in PDF.  Another handy guide is Little League's Tournament FAQ in PDF that answers questions on age requirements, residency affidavits, bith records, and more.  The Little League's Tournament Resource Page is here.