10 Most Common Birthdays In The United States
Top 10 most common birthdays in the U.S. Photo: KnowInsiders

September is a month full of back-to-school shopping, planning for labor day and… having babies? If you’re expecting a baby in September, you’ve got company! Studies have shown that nine out of ten of the most common American birthdays fall in the month of September. Let’s deep dive into this trend and understand why so many babies are born in September.

The list of top 10 most common birthdays in America

10. September 18

Average number of births per year: 12,055

9. September 16

Average number of births per year: 12,072

8. September 15

Average number of births per year: 12,087

7. September 20

Average number of births per year: 12,107

6. July 7

Average number of births per year: 12,108

5. September 10

Average number of births per year: 12,143

4. September 17

Average number of births per year: 12,148

3. September 12

Average number of births per year: 12,224

2. September 19

Average number of births per year: 12,229

1. September 9

Average number of births per year: 12,301

Why is September the most popular birth month in the U.S?

10 Most Common Birthdays In The United States
Photo: Verywell Family

September 9th is the most common birthday in the US, followed by September 19th. Another explanation for the popularity of September birthdays is elective births and induction. Many people who have the option to choose when they give birth avoid holidays because hospitals tend to be understaffed around the busiest holiday seasons. This explains why the least common birth dates are Christmas Eve, Christmas, and New Years Day.

The dates of conception for the nine out of ten top birthdays that fall in September are between December 17th and December 28th. It’s hard to determine exactly which day of conception is the most popular, as babies are not always conceived the day that you have sex. In fact, sperm can live in your fallopian tubes for up to 5 days while waiting for you to ovulate. Additionally, no two pregnancies are the same and babies that were conceived on the same day will most likely still have different birthdays.

While the zodiac signs associated with September are Libra and Virgo, these signs don’t take the cake for the most popular. 9.6% of the US population are Scorpios. Those born between October 22nd and November 21st are Scorpios, the most common zodiac sign. Next are Virgos at 9.4% of the population, followed by Geminis at 9.3%. The least common horoscope sign is Acquarius, accounting for 6.3% of the US population and falling on birth dates between January 19th and February 19th.

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Why is September 9th the most popular birthday in the U.S?

10 Most Common Birthdays In The United States
Photo: Distractify

September 9 is a pretty good day to be born. The ninth day of the ninth month makes for some nice symmetry when you’re filling out forms — and you happen to share a birthday with Adam Sandler, Michelle Williams (the actress, not the former Destiny’s Child member), Colonel Sanders (yes, he was real and yes, he was born on Sept. 9), three people I’m Facebook friends with — and millions of other people that help make it the most common birthday in the United States, according to recent research.

This is the part where you may want to put on your ear muffs; it turns out that the reason we September babies are so plentiful is that that stretch of birthdays — the nine days that took up the majority of the top 10 list — comes exactly nine months after Christmas/New Year's. And you all know, it sort of makes sense; it’s cold, people are celebrating, they’re oftentimes on vacation or back home for the holidays. What else are you supposed to do but make (September) babies?!

September 9th is the most common birthday in the US, followed by September 19th. Another explanation for the popularity of September birthdays is elective births and induction. Many people who have the option to choose when they give birth avoid holidays because hospitals tend to be understaffed around the busiest holiday seasons. This explains why the least common birth dates are Christmas Eve, Christmas, and New Years Day.

The dates of conception for the nine out of ten top birthdays that fall in September are between December 17th and December 28th. It’s hard to determine exactly which day of conception is the most popular, as babies are not always conceived the day that you have sex. In fact, sperm can live in your fallopian tubes for up to 5 days while waiting for you to ovulate. Additionally, no two pregnancies are the same and babies that were conceived on the same day will most likely still have different birthdays.

While the zodiac signs associated with September are Libra and Virgo, these signs don’t take the cake for the most popular. 9.6% of the US population are Scorpios. Those born between October 22nd and November 21st are Scorpios, the most common zodiac sign. Next are Virgos at 9.4% of the population, followed by Geminis at 9.3%. The least common horoscope sign is Aquarius, accounting for 6.3% of the US population and falling on birth dates between January 19th and February 19th.

More about births in the US:

  • Tuesday is the most common day of the week that women give birth, research shows.

  • About 4 million babies are born each year in the US, as of the early 21st century.

  • Vermont is the US state with the lowest birth rate, about 51 births per 1,000 women age 15 to 44. Utah is the state with the highest birth rate, about 88 births per 1,000 women age 15 to 44.
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