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February 29 has the fewest recorded births of any date here: 52,561 births. It occurred 5 times in these 21 years; every other date occurred 21 times.
Among dates that come every year, the rarest is December 25, with 138,628 recorded births, roughly 1 in 618 of all births in the sample.
February 29
Top 10 least common
Rarest birthday
Rarer than 100%of other birthday dates.
1 in 1,631births in this sample share your birthday.
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- 52,561births on February 29across 5 leap days
- 10,512per leap dayan average day has 11,175
- December 25rarest date that occurs every year1 in 618 births
- 5 of 10quietest dates on fixed holidaysplus Thanksgiving week
The ten least common birthdays
All 366 dates from most to least common
All 366 dates sorted by recorded U.S. births 1994–2014, coloured by rarity tier, with February 29 and the rarest every-year date marked.
| Date | Total births | Share of all births | |
|---|---|---|---|
| February 29 | 52,561 | 1 in 1,631 | |
| December 25 | 138,628 | 1 in 618 | |
| January 1 | 164,362 | 1 in 521 | |
| December 24 | 170,166 | 1 in 504 | |
| July 4 | 185,315 | 1 in 463 | |
| January 2 | 196,481 | 1 in 436 | |
| December 26 | 201,577 | 1 in 425 | |
| November 27 | 205,164 | 1 in 418 | |
| November 23 | 208,301 | 1 in 411 | |
| November 25 | 210,021 | 1 in 408 |
- February 29
- December 25
- January 1
- December 24
- July 4
- January 2
- December 26
- November 27
- November 23
- November 25
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The quietest dates fall on holidays
The rarest every-year dates are December 24–26, January 1, July 4 and the days of Thanksgiving week. That is an association between the calendar and the counts. The records hold daily totals only. The holiday page measures the gap for two moving holidays.
Related
The most common birthday · February 29 in detail · Browse all 366 dates
Sources, method and limits
Main ranking: 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014. CDC/NCHS daily counts for 1994–1999 and Social Security Administration daily counts for 2000–2014, as compiled by FiveThirtyEight and attributed under CC BY 4.0. The overlapping years 2000–2003 are counted once.
Ranks compare totals across the 366 observed month-and-day dates. February 29 occurred 5 times in this window; every other date occurred 21 times, so per-occurrence figures are used wherever seasonality is compared.
Every figure above comes from the administrative records named here, at the granularity those records publish: a day, a month or a year. Coverage and definitions differ between countries and eras, so two sources are combined only where their documentation states the windows are separate, and the page where that happens says so.
Full method, leap-day treatment and definitions.
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