Not only is this February the month of love, it is also leap year! Leap year occurs every 4 years, it is where we get an extra day in February! This happens because there are 365 days in the year and it takes 365.2422 days for the Earth to orbit the sun. So to keep all of our clocks and calendars in time with the Earth they created leap day.
Leap day is in February because every month has 30 or 31 days in it except for February and August. But the creator of the calendar added one more day to August so that it would have the same amount of days as July. Then February was declared the official date for leap day.
If your birthday is on leap day then you don’t get one! No I’m just messing with you. If your birthday really is on leap day (the chances are very, very slim) then you get to choose which day you want it to be on. So if you were turning 40 years old this year then you would be celebrating your 10th birthday today!