# The Birthday Calendar

> Aggregate official birth data. Daily lookup covers England and Wales only. Monthly UK series have different geography, timing bases and coverage; compare like with like.

## Data and methods

- [Data access and citation](https://england-wales-birthday-calendar-2026.netlify.app/data-access.html): definitions, caveats and all CSV downloads.
- [Dataset catalogue](https://england-wales-birthday-calendar-2026.netlify.app/datasets.json): columns, checksums and source caveats.
- [Interactive explorer and methods](https://england-wales-birthday-calendar-2026.netlify.app/#method): original official sources and calculations.
- [England and Wales daily births, 1995–2025](https://england-wales-birthday-calendar-2026.netlify.app/daily_births_1995_2025.csv): Exact daily occurrence counts. Includes births to mothers usually resident elsewhere. Daily lookup is England and Wales only.
- [England and Wales monthly births, 1938–2025](https://england-wales-birthday-calendar-2026.netlify.app/monthly_births_1938_2025.csv): Occurrence counts normalised by calendar days; use the source and provenance columns.
- [UK monthly birth series](https://england-wales-birthday-calendar-2026.netlify.app/uk_monthly_births.csv): Do not mix geography and timing bases. September 2008–August 2009 is unsourced for the separate England/Wales residence series. 2025 is partial and provisional for that split. Charts use complete years.
- [Monthly ONS reconciliation](https://england-wales-birthday-calendar-2026.netlify.app/ons_source_checks.csv): Recorded differences between official source extracts; counts have not been rescaled.
- [Annual ONS reconciliation](https://england-wales-birthday-calendar-2026.netlify.app/ons_annual_checks.csv): Annual country checks against source controls.

Retain ONS, NRS and NISRA attribution and Open Government Licence terms. Missing months are not zero; seasonal association does not establish causation. Read-only downloads; no submission API.