The Most Popular Birthdays In The US – 9 Of The Top 10 In The Same Month

What are the most popular birthdays in the US? Believe it or not, 9 out of the top 10 are in the month of September. We're also including the least common birthday as well. And we have to let you know some of the reasons birthdays are common or not. So here we go.

Sept. 9
Sept. 19
Sept. 12
Sept. 17
Sept. 10
July 7
Sept. 20
Sept. 15
Sept. 16
Sept. 18

So there's no exact reason why September contains the most popular birthdays in the US, but there are some theories. One of them is that people are doing lots of celebrating during the Christmas and New Year season, and one of those ways of celebrating is in bed. And that's why nine months later, September has the most popular birthdays in the US. Another theory, that's sort of related, is that with all the parties going on, there's lots of alcohol consumption, which can lead to lower inhibition and an increase in sexual drive. There's also more time off from work, which mean more time for sex.

There's also "one review of data from a health tracking app combined with birth records noted that the end of year sees a spike in fertility for a lot of women so that could be the true reason for the September birth spike." AND, it's said that men produce better quality sperm in the colder months.

"It's also possible that seasonal differences like daylight length are a contributing factor, as people are spending less time outside in the winter months and more time canoodling and thus baby-making." (Parents)

Dec. 25
Jan. 1
Dec. 24
July 4
Jan. 2
Dec. 26
Nov. 27
Nov. 23
Nov. 25
Oct. 31