
Australia's most common birthdays are in late September and early October, with September 17th being the most popular birthday. This is roughly nine months after the Christmas and New Year period, indicating that most Australians prefer to conceive during the holidays. The least common birthdays are on key holidays such as Christmas, Boxing Day, New Year's Day, Australia Day, and Anzac Day.
| Characteristics | Values |
|---|---|
| Most Common Birthday | 17th September |
| Second Most Common Birthday | 8th April |
| Third Most Common Birthday | 23rd September |
| Least Common Birthday | 29th February |
| Rarest Birthdays | December |
| Most Common Conception Dates | Christmas Day and New Year's Day |
| Busiest Month for Births | September |
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What You'll Learn

September 17 is Australia's most common birthday
According to data from the Australian Bureau of Statistics, September 17 is the most common birthday in Australia. The data, which covers a 10-year period from 2007 to 2016, reveals that there were 8,862 births on this date, making it marginally ahead of other popular birthdays like April 8 and September 23.
This date, September 17, is roughly nine months after the Christmas and New Year holiday period, indicating that many Australians may be conceiving during their summer holidays. This trend is not unique to Australia, with countries like New Zealand, the United States, and the United Kingdom also experiencing high birth rates in September.
The festive season provides an opportunity for families to spend time together, and it appears that many Australians take advantage of this time to plan for new additions to their families. While most people may not choose to give birth on a holiday, the data suggests that the holiday season is a popular time for conception.
Interestingly, the least popular birthdays in Australia tend to fall on or near public holidays, such as Christmas Day, Boxing Day, New Year's Day, Australia Day, and Anzac Day. It seems that both parents and medical professionals prefer to avoid having these special days interrupted by the arrival of a new baby.
So, if you're an Australian with a birthday on September 17, you're in good company! It's a date that many of your fellow citizens share, and it may even be a reflection of the festive cheer that brings families together.
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April 8 is the second most common birthday
The data revealed that September 17 is the most common birthday in Australia, with 8,862 births over the 10-year period. April 8 had a very similar number of births, with 8,829 births, just 33 fewer than September 17. This small difference of only 2-3 babies per year highlights the popularity of April 8 as a birthday in Australia.
The high number of births in September can be attributed to the festive season, as it is approximately nine months after Christmas and New Year's Day. This suggests that many Australians conceive during the holiday season, when people are off work and spending time with loved ones. While Australians may not want to spend a holiday giving birth, they seem to enjoy spending the holidays making babies.
April 8 is not the only spring birthday that is popular in Australia. The data also showed that September 23 and September 24 are among the most common birthdays in the country. Additionally, April 16 and April 29 also made it into the top 10 most common birthdays, indicating that spring is a busy time for births in Australia.
The least common birthdays in Australia tend to fall on or near public holidays. These include New Year's Day (January 1), Australia Day (January 26), Anzac Day (April 25), Christmas Day (December 25), and Boxing Day (December 26). It appears that both parents and doctors prefer to avoid having these special days interrupted by labour and delivery!
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September 23 is the third most common birthday
The popularity of birthdays in Australia is based on total births between 2007 and 2016. The data reveals a curious pattern: the least common birthdays tend to be key holidays or days adjacent to holidays, such as New Year's Day, Australia Day, Anzac Day, Christmas Day, and Boxing Day. This suggests that both parents and doctors prefer not to work on these days.
The peak birth season in Australia is late September and early October, which is consistent with trends in other Western countries. Researchers attribute this to "Christmas babies", conceived during the Christmas holidays when most people are off work. This is supported by the fact that December has the rarest birthdays, with 13% fewer births than the monthly average.
The most popular birthdays in Australia are clustered around September, with September 17, 23, and 24 being the top three dates. This is further evidence of the popularity of the holiday season for baby-making, as these dates are roughly nine months after the Christmas and New Year period. So while Australians may not want to spend the holidays giving birth, they certainly seem to enjoy spending the holidays conceiving!
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Conception is most popular in December
While December babies have the rarest birthdays in Australia, with births being nearly 13% less likely to fall in this month, it seems conception is most popular during this time.
The most common birthday in Australia is the 17th of September, with 8,862 births over a 10-year period. This date is roughly nine months after Christmas, suggesting that many Australians conceive during the Christmas and New Year holidays. This trend is also observed in other Western countries, including the US, France, England, Wales, and New Zealand.
The second and third most common birthdays in Australia are also in September, further supporting the idea that conception is popular during the holiday season. In fact, births peak in Australia in late September and early October, which aligns with the Christmas and New Year period.
While Australians may not want to spend their holidays giving birth, they seem to enjoy spending the holidays conceiving. This could be due to the increased time off work and festive cheer that the holiday season brings. So, while December may be the least common month for births, it is certainly a popular time for conception.
Additionally, the least popular birthdays in Australia tend to be public holidays, such as Christmas Day, Boxing Day, New Year's Day, Australia Day, and Anzac Day. This further supports the idea that Australians prefer to celebrate the holidays rather than give birth, opting to conceive instead.
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Births peak in late September and early October
Births in Australia peak in late September and early October. This is consistent with trends in other Western countries, including the USA, France, England, Wales, and New Zealand. Researchers attribute this phenomenon to the Christmas holidays, as counting back 38 weeks from Australia's most common birthdays (September 17, September 23, and September 24) reveals conception dates of Christmas Day and New Year's Day.
The festive season provides a plausible explanation for the spike in births, as more people are off work and in a celebratory mood. This trend is reflected in the least popular birthdays, which tend to fall on or near public holidays such as New Year's Day, Australia Day, Anzac Day, Christmas Day, and Boxing Day. Parents and doctors alike prefer to avoid having babies on these special occasions, opting instead for the holiday season to conceive.
The popularity of September birthdays extends beyond Australia, with September also being the most common birth month in New Zealand, the United States, and the United Kingdom. Notably, the specific dates of the most common birthdays differ slightly between these countries, with the United States favoring September 9th and the United Kingdom favoring September 26th.
While the Christmas holidays play a significant role in the peak of births in late September and early October, other factors may also contribute to this trend. For example, one source suggests that a heatwave may influence the timing of births, as many women gave birth shortly after a period of extremely hot weather. Additionally, the Southern Hemisphere's winter mating season, which falls between January and March, could also contribute to the higher number of birthdays in September.
Overall, the peak of births in late September and early October in Australia is a fascinating insight into the patterns of conception and birth. The combination of holiday celebrations, time off work, and seasonal influences creates a conducive environment for baby-making, resulting in a surge of birthdays during these months.
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Frequently asked questions
The most popular birthday in Australia is September 17th, with 8,862 births over a 10-year period.
September 17th falls roughly 9 months after the Christmas and New Year period, indicating that many Australians may be conceiving during the holidays.
Yes, April 8th and September 23rd are also popular birthdays, with 8,829 and 8,816 births over the same 10-year period, respectively.











































