Analysis of three decades of UK birth registrations reveals that September 26 tops the list, with an average of 1,927 babies born on that day each year between 1995 and 2025. The findings, released by the Office for National Statistics, also highlight a striking clustering of the ten most frequent birthdays within September and a dip in births on major public holidays.

September 26 tops the list with 1 ,927 births per year

According to the ONS data cited in the report, September 26 produced the highest average annual births – 1,927 babies – making it the nation’s most common birthday. This figure stands out against the overall average of roughly 1,800 births for the most popular dates,underscoring a pronounced seasonal peak.

All ten most frequent birthdays fall in September

The top ten dates – 26, 25, 27, 23, 30, 19, 22, 24, 18 and 29 September – dominate the ranking, suggesting that conception rates spike during the winter holidays. jay Zagorsky, a senior lecturer at Boston University, explains that shorter days and colder temperatures in December and January may biologically cue higher conception rates, which then translate into September births.

Holiday dates like Boxing Day rank as the least common

Boxing Day (December 26) emerges as the single least common birthday, followed closely by Christmas Day and New Year’s Day. The report links this scarcity to cultural avoidance of holiday births and to the fact that many parents simply do not plan deliveries on these dates.

Medical scheduling drives the low numbers on public holidays

Doctors’ preferences for time off during holidays and weekends heavily influence the data,as elective cesarean sections and inductions are rarely scheduled on such days. even spontaneous vaginal births can be affected when hospitals limit staffing, creating a systematic dip in holiday birth counts.

Why is April 1 unusually low?

April 1 averages only 1,686 births, a figure the source attributes to parents’ desire to spare children from April Fools’ teasing. The report does not provide deeper demographic analysis, leaving the cultural motive as a plausible but unverified explanation.