Here's a great article explaining the whole thing:
http://www.highlightskids.com/stories/year-confusion
And a cool website dedicated just to February 29th:
http://www.leapyearday.com/content/kids-pagehttp://www.leapyearday.com/content/kids-page
AND another cool website for kids:
http://www.kidsgeo.com/geography-for-kids/0021B-understanding-time-leap-year.php
This poem is SO helpful when you are trying to remember just how many days each month has...
Thirty days hath September,
April, June and November;
February has twenty eight alone
All the rest have thirty-one
Except in Leap Year, that's the time
When February's Days are twenty-nine
April, June and November;
February has twenty eight alone
All the rest have thirty-one
Except in Leap Year, that's the time
When February's Days are twenty-nine
