September is the busiest month to bring home a bundle of joy, according to data journalist Matt Stiles' analysis from 2016, which looked at the number of births in the United States broken down by day from 1994 to 2014. With an average of 12,301 births, September 9th is the most popular birthday overall. Eight other dates in September also had an average of more than 12,000 births.
Why, therefore, is September such a busy month for seeing the wonder of childbirth? A quick look at the calendar can provide some insight. Given that 38 weeks pass between conception and delivery, kids born on September 9 would have been conceived on December 17. Technically, December 27 should be the conception date of September 19, the second most common birthdate.
Obviously, kids don't always choose to arrive at the exact 38 weeks, but generally speaking, September babies were conceived in December. As Motherly notes, individuals typically take a break from work during the holidays, giving them more time to socialise, attend several parties, sip on additional cocktails, and expand their family.
It's often a romantic season
In addition, it's often a romantic season—December is the most popular month to get engaged, per a 2018 Brides poll.
Though largely speculative, scientists have put out their own theories to explain the high rates of conception in December. According to one idea, sperm are less active in the summer, while another contends that the uterine lining or the mother's eggs are less receptive to sperm during those months. Some believe that the reduced number of daylight hours in the winter may have an impact on our hormone levels.
Though largely speculative, scientists have put out their own theories to explain the high rates of conception in December. According to one idea, sperm are less active in the summer, while another contends that the uterine lining or the mother's eggs are less receptive to sperm during those months. Some believe that the reduced number of daylight hours in the winter may have an impact on our hormone levels.
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It's also likely that some individuals just believe September is a good month to start a family. There aren't any major holidays to mark, as Experian notes, so you can schedule an elective or induced delivery without worrying about hospitals running out of staff.
For whatever reason, you can always throw yourself a half-birthday party instead of trying to fit your birthday celebration around all the other ones in September—much fewer individuals were born in March.