I used to believe several things about hair, so I'm just going to combine them all into one post:
-When I was three or four, I wanted to grow my hair longer, and I believed that tipping my head back would magically make it grow.
-Until I was five or so, I believed that ponytails were prosthetic devices for girls and women with short hair, that had to be purchased at some special store, and removed every night.
-Until I was five or six, I believed that I could cut my dolls' hair, and it would grow back like mine did (I don't remember ever testing this theory, though).
-I believed that clowns were just born with Technicolour afros, or yarn pigtails or mop tops, or whatever they had.
-Until I was about, oh, maybe thirteen, I believed that there was a correlation between the colour of the hair on people's heads, and their pubic hair.....so, a red-headed person would have red pubic hair. This myth was disproven during a game of "Truth or Dare" at camp.
A childhood belief about hair

others believed things like this
- I believed that if you ate a piece of your own hair, a new strand of hair would grow on your head.— Ryo
- I used to believe that if I cut my dolls hair it would grow back just like mine did after a haircut. — diamond girl
- I used to believe that if i cut of my Barbie dolls hair that it would grow back.— Zena
- I really believed, underneath her hair, my mom had an eye in the back of her head.— Jessica
- I used to think that everybody's hair was black and if you had blond hair, you dyed your hair.— ~_~CoolKid93_~_
- I used to believe that my head was filled with hair waiting to grow.— Poppy