Most babies in the United States are born in the late summer to early fall months, with August and September being the peak months for births. Specifically:
- August is often the month with the highest total number of births overall. For example, in 2023, about 322,000 babies were born in August, making it the most common birth month by volume
- September has the most common individual birth dates, with 9 of the 10 most common birthdays in the US falling in September, including the most common birthday, September 9
- July and October also rank highly as popular birth months, typically following August and September in birth numbers
- The trend of more births in late summer and early fall corresponds to conceptions occurring during the holiday season in November and December, a time associated with increased fertility and sexual activity
In contrast, February is the least common birth month due to its shorter length and other factors
. In summary, while August generally has the highest number of births, September is notable for having the most common individual birthdays, making late summer and early fall the peak birth period in the US. This pattern is linked to conception timing around the winter holidays
