Is September a rare birth month? Most common
No. September is the most common of the twelve in the United States, with about 11,448 births per day.
September in numbers
Fifteen of the twenty most common birthdays of the year are in September, and none of the twenty rarest.
September 9 is the most common day, September 2 the rarest
September 9#1 of 366 · 11,900 births a yearMost common and rarest September birthdays
The five most common September birthdays
The five rarest September birthdays
Why September ranks #1
September is the most common month because of when people conceive, not because of anything in September.
- Thirty-eight weeks. Count back a full-term pregnancy from September 9, the most common birthday of all, and you land in the third week of December: the winter holidays.
- Fifteen of the top twenty. Fifteen of the twenty most common birthdays of the year are September dates. September 9, September 20 and September 19 are the top three.
- A ridge, not a plateau. September 1 is only #125 of 366. The peak sits in the middle of the month, from the 8th to the 27th, and both ends are ordinary.
September in 27 countries
September is #1 of the twelve in the United States. Across the other 26 countries it runs from #1 in Chile, Costa Rica, Guatemala, Mexico, England & Wales, Germany, Ireland, the Netherlands, Portugal, Slovenia, Japan, Malaysia, New Zealand and the Philippines to #8 in Argentina. It is the most common birth month in 14 of them.
RarestMost common
September against the other eleven
September averages about 11,448 births per day, the most common of the twelve. By total births it drops to #3, with only 30 days.
September is #1 of the twelve by births per day
About 11,448 a day in the United States, the most of any month; August is next with 11,405.
Quick answers
Is September a rare birth month?
No. In US birth records September is the most common of the twelve, with about 11,448 births per day. September 9 is the most common September birthday; September 2 is the rarest.
How many babies are born in September?
About 343,426 a year in the United States, #3 of the twelve by total births. Per day that is about 11,448, the most common of the twelve.
What is the most common September birthday?
September 9, #1 of 366 in the United States, with about 11,900 births a year (+9.7% against an average day). The rarest September date is September 2, #249.
What is the most common birth month?
September, with about 11,448 US births per day. The rarest month per day is January. February has the fewest births in total because it is the shortest month, not because its days are the rarest.