Birthday

A birthday is the day on which a person was born.

List of birthdays

 * Alberto - July 26
 * Arthur - May 25
 * Bailey - unknown, around the same time as Mrs. Barnes
 * Mrs. Barnes - unknown, around the same time as Bailey
 * Binky - November
 * Buster - Between January 21 and February 18
 * D.W. - Around November 24 (season 1); March 1 (as of season 3)
 * Doria - May 16
 * Fern - Soon after February 17; between September 23 and October 23
 * Francine - Between February 20 and March 20; Winter
 * James - March 22
 * Jane - six months, two weeks and four days after the snowball disappeared
 * Jenna - January
 * Ladonna - June
 * Muffy - May 25
 * Prunella - Winter
 * Thora - 18th day of a month with 31 days

Birthday parties

 * Arthur (season 1) also Arthur's Birthday (book) and Arthur's Birthday (game)
 * D.W. (season 3) also Arthur's Birthday Surprise
 * Emily (season 10) (season 16)
 * Galileo (season 3)
 * Kate (season 1)
 * Lisa (season 2, D.W.'s fantasy shows 8 candles)
 * Muffy (season 1)