The most common birthday is Sept. 9. In second and third place are Sept. 19 and 12. In fact, the entire top 10 list is made of September birthdays between Sept. 9 and 20.

The most common birthday is Sept. 9. In second and third place are Sept. 19 and 12. In fact, the entire top 10 list is made of September birthdays between Sept. 9 and 20.

Though September dominates the top ten most common birthdays, August is actually the most common birth month. According to the birth data, there were just under 7,600,000 births in August between ...