The Most Common Birthdays in the World

By Geoffrey Migiro on December 11 2019 in World Facts

Believe it or not, there is a pattern when it comes to birth dates.

September has been the common birthday month for the last two decades in the United States with February being the least typical birth month. In 2006, researchers from Harvard University examined the birth rates from 1973 to 1999 and concluded that many people are usually born on September 16. A more recent report by Matt Stiles confirmed that September 9 is the most common birthday date. Stiles developed a visualization based on information compiled on all the births from 1994-2014. The data was obtained from the National-Center for Health Statistics. According to the data, 9 out of the top-10 birthday dates are in September which means that they were conceived from December 17 to December 28.

The Most Common Birthdays

September 9

September 9 is the most common birth date on the planet, which has seen an average of 12,301 births from 1994 to 2004 in the United States alone. All the people born on September ninth are usually conceived on December 17 of the previous year. 

September 19

The second most common birthday is September 19. The United States recorded an average of 12,229 births on September 19 from 1994 to 2014. Theoretically, all the people who were born on September 19 were conceived on the day after Boxing Day in the previous year on December 27. The people born on the two most common birthdays on the planet were conceived during the holiday season in December.

September 12

The third most common birthday date in the world is September twelfth. According to the data from the National-Center for Health Statistics, there was an average of 12,225 births in the United States from 1994 to 2014. Since the total gestation period of human beings is 38 weeks, most of the people born on September 12 were conceived on December 20, the previous year.

September 17

September 17 is the fourth most popular birthday date when an average of 12,148 individuals are born in the United States. People born on September 17 were conceived on the Christmas day. 

What Are The Least Popular Birthday Dates?

The winter months in the United States like January, February, and December are the least common times for mothers to give birth. Due to the cold weather conditions, most parents avoid giving births in winter. The least popular birthday dates on the planet are January 1, December 24, and December 25. On average about 6,574 babies were born on Christmas day from 1994 to 2014 after they were conceived on April 3. 7,792 babies, who were conceived on April 10, are born on January 1. The dates before and after Thanksgiving are also not very common birthday dates.

The Most Common Birthdays in the World

RankBirthdayPosition
1September 9th1
2September 19th2
3September 12th3
4September 17th4
5September 10th5
6July 7th6
7September 20th7
8September 15th8
9September 16th9
10September 18th10

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