February is generally considered the rarest birth month.
This is primarily due to February being the shortest month of the year, having only 28 days in common years and 29 days in leap years. Fewer days naturally lead to fewer births. Furthermore, February 29th represents the single rarest birthdate because it only occurs once every four years. This makes individuals born on that day statistically unique.
Therefore, while all days in February are relatively less common birth dates, February 29th is the absolute rarest.
