The Most and Least Common Birthdays

Interestingly, the most and least common birthdays align with actual birth data, revealing that while the holidays are a popular time to conceive, they aren’t typically a time when many babies are born.

Understanding your due date involves knowing much more than when you can anticipate your child’s birth. It will impact everything from the practicalities of your labor to the time of year your child will celebrate his or her birthday.

Wondering if your soon-to-be-born child will share a birthday with the majority of their classmates during the most popular birthday month? Or perhaps they will be born on the least frequent day of the year for newborns to make their grand debut. Due to a viral blog article by Matt Stiles of The Daily Viz, you can determine that.

The Facts

Maybe the best aspect of Stile’s viral post is that the data is presented in a colorful heat map, making it easier to interpret the numbers. The stunning exhibition demonstrates that September is a busy month for births.

The data also reveals that, as entertaining as it may be to determine how uncommon your birthday is (or is not), the approach has a little flaw: the busiest days for births are not significantly busier than the rarer days. According to the author, the busiest days on the calendar have 12,000 births, while the least busy days have approximately 6,500 births, with 11,000 being the median.

Still, it is enjoyable to visit. Interested to see where your child’s birthday is projected to fall? Below are the most common birthdays in the United States.

The Most Common Month of Birth

Utilizing actual birth data (covering 20 years of U.S. births) collected by FiveThirtyEight from the National Center for Health Statistics and Social Security Administration, Stiles determined that September is the most popular month for giving birth in the United States. In fact, nine of the top ten birthing days happen between September 9 and September 20.

The obvious question is why?

Many couples are conceiving in December and around the holidays, according to Whitney Casares, M.D., M.P.H., F.A.A.P., author of The New Baby Blueprint: Caring for You and Your Baby. It makes sense that they may be more likely to become pregnant during the festive seasons.

According to a study published in Obstetrics and Gynecology, couples may have more success conceiving during the winter season due to higher-quality sperm in the winter than in the summer. “They also hypothesized that changes in the amount of daylight could make an ovum’s environment more favorable for sperm,” she explains. “More research is required to comprehend this intriguing occurrence.

Most Common Birthdays

Experian determined that September 9 is the most popular birthday in the United States. It is shared by the comedian Adam Sandler, the actor Hugh Grant, the jazz musician Michael Bublé, the Russian literary great Leo Tolstoy, and the inventor of KFC, Colonel Sanders. The second most frequent birthday is September 19, followed by September 12, September 17, and September 10, and the first non-September date: July 7.

Top Ten Most Common Birthdays

  1. September 9 (9/9)
  2. September 19 (9/19)
  3. September 12 (9/12)
  4. September 17 (9/13)
  5. September 10 (9/10)
  6. July 7 (7/7)
  7. September 20 (9/20)
  8. September 15 (9/15)
  9. September 16 (9/16)
  10. September 18 (9/18)

Less Common Birthdays

Interestingly, the least frequent birthdays in the United States cluster around important holidays. December 25 (Christmas Day) is the least frequent birth date, followed by January 1 (New Year’s Day). The third least common birthdate is December 24 (Christmas Eve), while July 4 (Independence Day) is the fourth least common birthday.

Several rarest birthdays also cluster around Thanksgiving (the fourth Thursday of November), which might occur anywhere from November 22 to November 28. October 31 is the tenth least frequent birthdate (Halloween).

Top Ten Least Common Birthdays

  1. December 25 (12/25)
  2. January 1 (January 1)
  3. December 24 (12/24)
  4. July 4 (7/4)
  5. February 2 (half)
  6. December 26 (12/26)
  7. November 27 (11/27)
  8. November 23 (11/23)
  9. November 25 (11/25)
  10. October 31(10/31


Hence, if you become pregnant during the holidays, your child will likely not have much competition for celebrations as they mature. But if you conceived during the holidays, be prepared for an onslaught of cupcakes and numerous “Happy Birthday” performances in September.

Meaningful articles you might like: How to Foster Your Child’s Imagination and Creativity, Moms Who Plan a Birthday Party Knows The Last-Minute Invitation, 8 Summer Birthday Party Ideas For Your Children