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Most Common Birthdays

What is the most common birthday in the world? Explore demographic studies, seasonal birth frequency triggers, and holiday rankings.

Published: June 21, 2026
Editorial Authored
6 min read

Have you ever wondered if your birthday belongs to a crowded day of delivery rooms, or a rare secluded date? Demographic studies analyzing millions of records reveal clear seasonal triggers.

The September Baby Boom

Statistically, mid-to-late September is the most populous time of the year for live births, with September 16th and September 9th constantly ranking as the peak calendar positions. This peak perfectly maps to cozy winter holidays and family gatherings nine months prior!

The Rank List of Populous Birthday Positions

According to extensive national insurance databases, here are the top 5 most common days:

  • September 9th - Peak deliveries frequency
  • September 19th - Dynamic autumn cycle
  • September 12th - High medical schedulings
  • September 17th - Consistent seasonal surge
  • September 10th - Mid-month harvest cycle
Most Common Birthdays – Ranked Populous Calendar Dates