Most and Least Common Birthdays Ranked Showcasing Unique Insights

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The Most & Least Common Birthdays Ranked in 2025

Birthdays carry a special significance in everyone’s life, but some dates are more popular than others when it comes to celebrating the day a person was born. Over the years, research and statistical analyses continue to reveal intriguing trends about which days of the year are the most and least common for birthdays. Here’s a detailed breakdown of the latest findings in 2025, highlighting the most popular birthdays and the surprising days that see fewer celebrations.

1. The Most Popular Birthdays in 2025

a. September 16th Tops the Charts
In 2025, September 16 emerged as the most common birthday nationwide. This trend has been consistent over the past decade, with many parents citing late December or early January as their conception window, leading to a spike in September births. The date’s popularity is linked to holiday season timing, making it a favored choice for new parents.

b. September 9th and 17th Also Rank High
Other near-top dates include September 9th and September 17th, which have also seen increased birth rates in 2025. These dates often coincide with late summer pregnancies, a period associated with higher conception chances during the warmer months.

c. Spring and Early Summer Birthdays Are Gaining Popularity
Interestingly, April 20th and May 5th have seen a jump in birth numbers in 2025. Allergist and pediatrician Dr. Lisa James notes that families tend to schedule elective births or plan pregnancies during less busy times of the year, contributing to these trends.

2. The Least Common Birthdays in 2025

a. February 29th Holds Unique Status
As expected, February 29th, the rare leap day, remains the least common birthday. Although it occurs every four years, only a small percentage of individuals are born on this date, making it a unique and special occasion for those who celebrate it.

b. December 25th and December 24th Have Low Birth Counts
Christmas Eve and Christmas Day are notably among the least common birthdays. Medical professionals have observed that many scheduled cesarean deliveries or induced labors are avoided on major holidays, leading to fewer births on these days.

c. Early January and Late November See Fewer Births
Data indicates that the first days of the year in January and the days immediately before and after Thanksgiving in November also tend to have fewer birthdays. Families often prefer to schedule births outside the hustle of major holidays and vacation periods, resulting in lower birth rates during those times.

3. Interesting Patterns and Possible Explanations

a. Holiday Effect and Family Planning
Many parents intentionally plan deliveries around holiday seasons, aiming for convenient birthdays that don’t disrupt family gatherings. This contributes to higher counts in September and early fall.

b. Medical Scheduling Practices
Medical professionals often avoid scheduling elective births on holidays or weekends, which explains the lower counts on Christmas, New Year’s Day, and Thanksgiving.

c. Seasonal Influences and Fertility Trends
Some researchers suggest that seasonal changes, including variations in temperature, sunlight, and social behaviors, influence conception rates, ultimately shaping birthdate patterns.

4. Regional and Cultural Variations

While the above trends are prevalent across the United States, regional differences do exist. For example, some areas with cultural or religious observances might see deviations in birthdate popularity. Additionally, demographic factors such as socioeconomic status or access to healthcare can influence birth trends.

5. Future Trends and Expectations for 2026

Experts predict that these patterns will remain mostly consistent into 2026, with some fluctuations due to shifting social behaviors or advances in medical technology. The rise of planned elective births and cesarean sections might further solidify certain dates as more popular, while holidays continue to see fewer natural births.

In Summary:
Birthdays are more than just dates; they reflect social, cultural, and biological patterns. September, particularly the 16th, continues to be the most common birthday in the U.S. in 2025, while the rarity of February 29th and Christmas-related dates makes them uniquely exceptional. Understanding these trends offers a glimpse into the many factors influencing when babies come into the world, shaping birthday celebrations for years to come.