10 Least Common Birthdays in the United States
Top 10 least common birthdays in the U.S. Photo: KnowInsiders

Birthdays always seem to fall on random days, which makes for a great excuse to celebrate during an otherwise slow time of the year. However, a select few people are born on rather rare dates. In fact, according to Zippia, a career research company that created a birthday heat map using the most recent decade-long data from the Social Security Administration and the Centers for Disease Control and Prevention (CDC)'s National Center for Health Statistics, the least common birthdays are on or around popular holidays, including Independence Day, Thanksgiving, Christmas, and more.

Read on and discover which birthdays are the rarest as well as how many babies, on average, are born on the same day. And on the opposite end of the spectrum, This Is the Most Common Birthday in the U.S.

The list of top 10 least common birthdays in the U.S:

10. October 31

Average number of births per year: 9,978

9. November 25

Average number of births per year: 9,954

8. November 23

Average number of births per year: 9,883

7. November 27

Average number of births per year: 9,718

6. December 26

Average number of births per year: 9,543

5. January 2

Average number of births per year: 9,307

4. July 4

Average number of births per year: 8,796

3. December 24

Average number of births per year: 8,069

2. January 1

Average number of births per year: 7,792

1. December 25

Average number of births per year: 6,574

10 Least Common Birthdays in the United States

Photo: Pinterest

Why is December 25th the least common birthday in the U.S?

One theory is that people are actually getting it on over the holidays to conceive babies that will be born in September, the most common birth month. This data-driven graph shows that most common birthdays fall in the middle of September, with Sept. 9 being the most popular birthday of all (an average of 12,301 births!), which The Daily Viz claims would be conceived between December 17 and 27. Apparently, when there's lots of time off, parties, and festive tipples to enjoy, things heat up between the sheets. Unfortunately, a Christmas birthday's presumed conception date of April 3 doesn't provide the same social opportunities to enjoy more alone time with your beloved as other dates on the calendar.

The graph's author, Mark Stiles, also suggests that with the rise of planned births, doctors and parents are careful to avoid scheduling inductions or cesarean sections for Christmas Day. As Scientific American explained, there's been a marked shift in the last few decades from largely spontaneous births to babies being born during business hours. Nearly half of all American births these days are either scheduled cesarean sections or inductions, the article says, so it only makes sense to perform those procedures when your doctor's on the clock — and they likely won't be on Christmas. Thanks to this trend, births peak at 8 a.m. on Monday mornings and are driven by scheduled cesarean sections to start the week. The article also corroborates Stiles' assertion that people are more likely to conceive babies during the cold months when everyone is either partying over the holidays or locked inside together.

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Unrecorded births

Unfortunately, similar data for non-English-speaking countries are not widely available.

Research into when people were born is relatively new because for centuries no one needed or completed a birth certificate. In the U.S., birth certificates have been widely used only since the end of World War II.

While some countries require all births to be registered, one out of every four children born in the world today does not officially exist, since there is no record of his or her birth.

The United Nations has some world data, which show popular birth months tend to shift by latitude. Countries at high latitudes, like Norway or Russia, have peak birthdays in July or August. Countries closer to the equator, like El Salvador, have peak birthdays later in the year, like October.

As for my wife, she was born a few hours after her parents welcomed her in another year. Her birth was a surprise to all the guests they invited over to celebrate the New Year. We joke that being born then is the best day, because there is always a party with fireworks for her birthday. It is also a great day because there are never any competing birthday parties.

So if you are born on a holiday like Christmas, New Year's, or even April Fools' Day, take some comfort in knowing the relative rarity of your birth makes you even more special than you already are.

While Christmas babies tend to have mixed feelings about competing with the holiday for a little birthday love, according to The Globe and Mail, there are undoubtedly good things about being born at the end of the year. Though they seem to be a dying breed, Slate's L.V. Anderson makes a compelling case for Christmas kids. First, she says, while the rest of us plebes end up at work or school on our actual birthdays, those who were born on or around Christmas are more likely to spend the day exactly how they want when they're grown. They already have the time off, family is near and there's a whole lot of festive energy that can be expelled on the birthday baby. She writes, "For the indolent, among whom I count myself, having a Christmas birthday is the best-case scenario: maximum merriment for minimum effort."
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