What was the most common birthday in 1998?

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

December 29most births in 1998a Tuesday, 13,637 births
December 25fewest births in 1998a Friday, 7,020 births
Septemberbusiest month per day11,446 births per day
Tuesdaybusiest weekday12,393 per day against 7,829 on Sunday

In 1998 the United States recorded 3,941,553 births over 365 days, 10,799 on an average day. The busiest single date was December 29, a Tuesday, with 13,637 births; the quietest was December 25, a Friday, with 7,020. Within one year every date has one weekday, so the weekday column below is a fact of that date.

Every day of 1998: recorded U.S. births

Every day of 1998 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 1998

Dates of 1998 with the most recorded U.S. births
Date	Weekday	Births	% of an average day
December 29	Tuesday	13,637	126.3
September 9	Wednesday	13,501	125.0
September 10	Thursday	13,306	123.2
December 30	Wednesday	13,297	123.1
December 22	Tuesday	13,286	123.0
November 24	Tuesday	13,143	121.7
July 14	Tuesday	13,034	120.7
September 18	Friday	13,030	120.7
September 15	Tuesday	12,975	120.2
September 11	Friday	12,920	119.6

The quietest dates of 1998

Dates of 1998 with the fewest recorded U.S. births
Date	Weekday	Births	% of an average day
December 25	Friday	7,020	65.0
April 5	Sunday	7,240	67.0
April 12	Sunday	7,330	67.9
December 13	Sunday	7,460	69.1
April 19	Sunday	7,557	70.0
June 7	Sunday	7,558	70.0
January 25	Sunday	7,586	70.2
December 6	Sunday	7,614	70.5
November 8	Sunday	7,615	70.5
March 22	Sunday	7,625	70.6

1998 by weekday and by month

Weekend days in 1998 recorded 70% 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.

1998: births per day by weekday

Seven columns, Monday to Sunday, average recorded births per day in 1998.

1998: births per day by weekday
Weekday	Days	Births per day
Tuesday	52	12,393
Wednesday	52	12,051
Thursday	53	11,874
Friday	52	11,700
Monday	52	10,997
Saturday	52	8,726
Sunday	52	7,829

1998: births per day by month
Month	Births	Births per day
September	343,384	11,446
July	348,651	11,247
August	344,736	11,121
June	327,091	10,903
December	333,896	10,771
October	332,790	10,735
February	298,711	10,668
May	330,519	10,662
April	319,758	10,659
March	329,436	10,627
November	313,241	10,441
January	319,340	10,301

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Sources, method and limits

Source for 1998: CDC/NCHS daily births for the United States, as compiled by FiveThirtyEight (CC BY 4.0). Years before 2000 come from the CDC/NCHS file; 2000 onward from the SSA file, so a comparison across that line is also a change of source. 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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