To tease my daughter who is 5 years old, I told her that we didn't really know if she was a girl or boy yet because a person doesn't grow a "boy private" until age six. She freaked at the possibility that she may turn into a boy and it took me a week to convince her otherwise.
A childhood belief about rude bits

others believed things like this
- i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- When I was young I want to grow up yo be a trash man, becuse they only work one day a week.— Steve H
- my mother told me if i ever swallowed chewing gum i'd turn into a pig, i believed this for many years.— stuart hayward
- one of my friend's was told by his father that if you didn't turn mirrors over the reflection would run out.— pri
- im a girl and i used to think my mom had a penis and i would eventually grow my ownAnon
- When I was a little girl I used to believe that when I grew up I'd turn into a man.— Jessica