9 September is the most common US birthday due to increased births in July-September months.

September 9th is identified as the most common birthday in the U.S., with September 19th and 12th following. This trend correlates with increased births in July, August, and September, attributed to higher conception rates during the holiday season. August is the most common birth month, while February sees the fewest births. Additionally, various restaurants offer birthday freebies for rewards members, including Starbucks and Denny's.

September 09, 2024
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