What was the most common birthday in 2003?

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

December 30most births in 2003a Tuesday, 14,700 births
December 25fewest births in 2003a Thursday, 6,744 births
Septemberbusiest month per day12,211 births per day
Tuesdaybusiest weekday13,269 per day against 7,672 on Sunday

In 2003 the United States recorded 4,163,060 births over 365 days, 11,406 on an average day. The busiest single date was December 30, a Tuesday, with 14,700 births; the quietest was December 25, a Thursday, with 6,744. Within one year every date has one weekday, so the weekday column below is a fact of that date.

Every day of 2003: recorded U.S. births

Every day of 2003 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 2003

Dates of 2003 with the most recorded U.S. births
Date	Weekday	Births	% of an average day
December 30	Tuesday	14,700	128.9
September 3	Wednesday	14,427	126.5
September 16	Tuesday	14,399	126.2
September 23	Tuesday	14,376	126.0
September 10	Wednesday	14,180	124.3
September 4	Thursday	14,161	124.2
August 28	Thursday	14,099	123.6
September 18	Thursday	14,066	123.3
September 17	Wednesday	14,018	122.9
August 26	Tuesday	14,008	122.8

The quietest dates of 2003

Dates of 2003 with the fewest recorded U.S. births
Date	Weekday	Births	% of an average day
December 25	Thursday	6,744	59.1
April 20	Sunday	7,155	62.7
April 13	Sunday	7,234	63.4
April 6	Sunday	7,265	63.7
January 12	Sunday	7,297	64.0
November 30	Sunday	7,330	64.3
November 27	Thursday	7,340	64.4
December 7	Sunday	7,383	64.7
November 23	Sunday	7,383	64.7
March 9	Sunday	7,387	64.8

2003 by weekday and by month

Weekend days in 2003 recorded 65% 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.

2003: births per day by weekday

Seven columns, Monday to Sunday, average recorded births per day in 2003.

2003: births per day by weekday
Weekday	Days	Births per day
Tuesday	52	13,269
Wednesday	53	12,842
Thursday	52	12,743
Friday	52	12,616
Monday	52	11,940
Saturday	52	8,730
Sunday	52	7,672

2003: births per day by month
Month	Births	Births per day
September	366,321	12,211
July	370,236	11,943
August	366,421	11,820
October	360,634	11,633
June	342,884	11,429
May	352,315	11,365
December	350,644	11,311
April	335,691	11,190
February	312,789	11,171
March	342,574	11,051
November	326,388	10,880
January	336,163	10,844

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Sources, method and limits

Source for 2003: 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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