When I was little I held the adament beliefe that girls only became girls when their willies dropped off.
My mum brings it up to this day.
A childhood belief about rude bits

others believed things like this
- I thought that the difference between girls and boys was that girls have teeth.
Anon - I used to believe all babies came out as girls and later on in life some of those girls turned into boys — Tom
- I used to believe that boys, gave birth to boys and girls gave birth to girls. How i'm so wrong now.— Sarah
- i used to believe that males' poo came out of their willies— Helen W
- I used to think it was possible for girls to pee standing up. I even tried.Anon
- I used to think that girls get pregnant by seeing manAnon