The month with the most birthdays varies slightly depending on the country and data source, but in the United States, August is generally the most common birth month by total number of births, followed closely by July and September. However, when looking at the most common individual birth dates, September dominates, with nine of the ten most common birthdays falling in September, especially around mid-September (e.g., September 9 is the most common birthday)
. Key points:
- August has the highest total number of births in the U.S., followed by July and then September
- September has the most common individual birth dates, with many birthdays clustered between September 9 and September 20
- The popularity of September birthdays is linked to a peak in conceptions during December, possibly due to holiday season factors
- In other countries like the Netherlands, September is also the month with the most birthdays, followed by May and June
In summary, August is the month with the most births overall in the U.S., but September has the most common birthday dates, making it the month with the most birthdays on a daily basis. Sources:
BabyCenter (2023 CDC data)
Dutch birth data (2023)
U.S. birth data analysis (1994-2014 and recent CDC)
Explanation of September births linked to December conceptions
