In 2006, Harvard University researchers reviewed birth rates from 1973 to 1999 and determined that many individuals are born on September 16. According to a more recent analysis by Matt Stiles, September 9 is the most prevalent birthday date. Stiles provides two reasons why this date was selected: first, there are 48 days in the year and second, there are three Tuesday births each month. Harvard's study found that September 9 is the day that people were born most often, with one out of every five babies being born on that day. Next most common is September 16, followed by August 23 and October 28. The least common birthdays include January 5, February 2, March 3, April 6, May 4, June 1, July 4, August 7, September 8 and October 27. The most common birth month is September, followed by August and July. December remains the least common month, followed by November and October. ---