About This Data

This page shows real birthday distribution data aggregated by month and day across multiple decades. The data reveals fascinating patterns in when people are born throughout the year.

Interestingly, birthdays are not evenly distributed throughout the year. September is typically the most common birth month in many countries, while January and February tend to have fewer birthdays. This pattern is often attributed to conception rates during the holiday season. You can also notice spikes on January 1st and other dates that may have been used as default entries in historical records.