I used to believe that you could only be born on a holiday or someone else's birthday. Funny enough I still believe that now..my oldest daughter was born on my birthday, and my other daughter was born on "Patriot's Day" (the OLD patriots day AKA Paul Revere's Midnight Ride not to be confused with the new one on Sept 11th.)
Just where does this belief come from? Hmmm...
My Bday April 4th (sometimes also Easter)
May 31/June 2 & 3rd Parents Anniv, bdays
Feb 18 Bro's Birthday (near Valentine's Day, honest to god he was late, and I thought my parents were worried because he missed the 14th, but made up for it by being born in the car in a blizzard!)
and my poor little brother was born on Oct 15....so I saved him by getting married on Oct 16th!
And he still won't let me live down that his birthday was overshadowed by my Rehearsal Dinner! :-)
So now..I tell the children it's the truth, you just don't know the person who shares your birthday yet, or the holiday will be invented just wait!
A childhood belief about birthdays

others believed things like this
- I thought I was such a lucky and special kid, because I was born on the exact same day as my birthday.— ricolarno
- My friend thought it was SO WIERD that he was born on his birthday when I told him he was.Anon
- I used to believe because I was born I Abe Lincoln's birthday I had a better shot at being President.— END
- Since I was born on the 4th of July, I really thought the entire country celebrated my birthday.— -Stoddard
- My parents have the same birthday -- month, day, and year. I though all mom's and dad's had the same birthday.— Cait
- I used to believe that I was older than my brother because I was born in June and he was born in OctoberAnon