Little League® Baseball has announced a nationwide change regarding youth age and eligibility. The cutoff date for determining a player's age will switch to August 31 for all players. Players born after August 31, 2005 will have this rule take effect immediately. Players born on or before August 31, 2005 will see the rule go into effect during the 2018 Little League season. (Until 2018, the previous cutoff date of April 30 will apply to these older players.)
Here's an excerpt about the impact upon your child or children:
If your child was born between January 1 and April 30, there has been no impact in any of the Age Determination Date changes.
If your child was born between May 1 and August 31, there is no change from the previous age change and implementation.
If your child was born between September 1 and December 31, he or she essentially reverts back to where they were from a League Age standpoint prior to the 2015 season, and, like those born between January 1 and April 30, there is no impact on them.
You can get more information about the new rules at the national Little League Baseball website, which includes an updated chart for determining age.