When I was a child I used to think you only grew on your actual birthday. So on my birthday I would stare hours at the mirror. I guess it's because once I asked my mom when I would be bigger, and she probably said: "when you turn 5".
A childhood belief about birthdays

others believed things like this
- iwas told that if u cry on your birthday you would not get any bigger 4 a whole year— steve
- Up until I was almost 11, I thought that a birthday suit was a special outfit you wore only on your birthdayAnon
- I used to think that a birthday suit was a special outfit you wear on your birthday— Bri
- I used to believe that on your birthday everybody would worship you! (I guess I was wrong).— supergirl
- I used to believe that on your birthday, you didn't advance to your next age until you ate your birthday cake.— Casi
- My parents have the same birthday -- month, day, and year. I though all mom's and dad's had the same birthday.— Cait