Here's some information that I think many don't realize in this thread:
From USALacrosse website: 2015 Age Grouping Born on or after 9/1/2005 is U9
This decision is not random or redshirting, the majority of states in the US have cutoffs in August through Sep 1 for kindegarten, including Maryland. Therefore, if you are at a travel tournament or eventually play college level, your child will always play against children in this age range. Therefore, it would actually hurt your child if lacrosse in NY used a December cutoff because they would not have the same level of experience in play that everyone else in the country is having in the same grade level/graduating class. New [lacrosse] is a fact, one of only a handful of states with December as the cutoff for public schools, most NY independent private day and boarding schools have a September 1 cutoff. Here are the kindergarten cutoffs by state: Alabama- September 1 Alaska- August 15
Arizona- September 1
Arkansas-September 15
California-October 1(2013-14) September 1(2014 onwards)
Colorado- September 15
Connecticut-October 1
Delaware - August 31
Florida-September 1
Georgia- September 1
Hawaii-December 31
Idaho- September 1
Illinois-September 1
Indiana- August 1
Iowa- September 15
Kansas-August 31
Kentucky-October 1
Louisiana- September 30
Maine-October 15
Maryland-September 1
Massachusetts-September 1
Michigan-November 1(2013-14), October 1(2014-15), September 1(2015 onwards)
Minnesota-September 1
Mississippi-September 1
Missouri-August 1
Montana- Sept 10
Nebraska-October 15
Nevada-September 30
New Hampshire-September 30
New Jersey-October 1 and later (choice left to school district)
New Mexico - September 1
New [lacrosse]-December 1
North Carolina-October 16
North Dakota- August 1
Ohio-August 1 or Septemer 30(choice left to school district boards)
Oklahoma- September 1
Oregon-September 1
Pennsylvania - Choice left to local school district
Rhode Island- September 1
South Carolina- September 1
South Dakota - September 1
Tennessee - August 31
Texas-September 1
Utah-August 31
Vermont-August 31 - Dec 31 (Choice left to local school district)