Cool little infographic via NPR showing how common each day of the year is for births (data is from 1973-1999). September 16th is the most common, and February 29th is the least (obviously).

http://nprfreshair.tumblr.com/post/23161548487/how-common-is-your-birthday-via-stiles

If you want to see the data table itself to see where your birthday ranks, it's from NYT here: http://www.nytimes.com/2006/12/19/business/20leonhardt-table.html

So where does your birthday rank? Or LOs?