Public health record indicate that birthdays in America are for the most part evenly distributed throughout the year.
For some reason October 5th has more children born than any other day! Why is this?
There tend to be more births in September and October because there is a holiday season nine months prior and the longest nights of the year in the Northern Hemisphere fall nine months before those two months.
Also, based on Harvard research on birth records, December 25th is the least common birthday!