What was the most common birthday in 2013?

Published by Birthday Traffic · September 15, 2026 · Sources and method

September 4most births in 2013a Wednesday, 13,680 births
May 5fewest births in 2013a Sunday, 6,609 births
Augustbusiest month per day11,512 births per day
Tuesdaybusiest weekday12,469 per day against 7,242 on Sunday

In 2013 the United States recorded 3,973,337 births over 365 days, 10,886 on an average day. The busiest single date was September 4, a Wednesday, with 13,680 births; the quietest was May 5, a Sunday, with 6,609. Within one year every date has one weekday, so the weekday column below is a fact of that date.

Every day of 2013: recorded U.S. births

Every day of 2013 in calendar order as one line, with the busiest and quietest dates marked and the year’s average day drawn across it.

The regular dips are weekends. The deepest dips are fixed holidays.

The busiest dates of 2013

Dates of 2013 with the most recorded U.S. births
Date	Weekday	Births	% of an average day
September 4	Wednesday	13,680	125.7
November 12	Tuesday	13,669	125.6
December 27	Friday	13,588	124.8
September 17	Tuesday	13,542	124.4
September 12	Thursday	13,460	123.6
September 10	Tuesday	13,440	123.5
July 2	Tuesday	13,437	123.4
July 9	Tuesday	13,408	123.2
December 3	Tuesday	13,352	122.7
September 5	Thursday	13,337	122.5

The quietest dates of 2013

Dates of 2013 with the fewest recorded U.S. births
Date	Weekday	Births	% of an average day
May 5	Sunday	6,609	60.7
March 10	Sunday	6,610	60.7
December 25	Wednesday	6,620	60.8
April 21	Sunday	6,722	61.7
March 31	Sunday	6,735	61.9
February 10	Sunday	6,735	61.9
April 7	Sunday	6,796	62.4
April 28	Sunday	6,852	62.9
February 3	Sunday	6,876	63.2
May 26	Sunday	6,880	63.2

2013 by weekday and by month

Weekend days in 2013 recorded 64% of a weekday’s births per day. The quietest dates above are mostly weekend days and fixed holidays; the busiest are weekdays in late summer. The counts show the association.

2013: births per day by weekday

Seven columns, Monday to Sunday, average recorded births per day in 2013.

2013: births per day by weekday
Weekday	Days	Births per day
Tuesday	53	12,469
Thursday	52	12,194
Wednesday	52	12,190
Friday	52	12,133
Monday	52	11,732
Saturday	52	8,211
Sunday	52	7,242

2013: births per day by month
Month	Births	Births per day
August	356,879	11,512
September	341,676	11,389
July	352,495	11,371
October	344,285	11,106
December	339,399	10,948
June	322,868	10,762
November	322,157	10,739
May	332,868	10,738
January	327,352	10,560
February	294,882	10,532
April	314,847	10,495
March	323,629	10,440

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Sources, method and limits

Source for 2013: Social Security Administration daily births for the United States, as compiled by FiveThirtyEight (CC BY 4.0). The 2000–2003 overlap between the two files is taken from the SSA file only. Weekday is taken from the record’s calendar date. Ranks within a year compare single days.

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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