I used to think that parents chose the gender of their child when 'it' was born. They were all born with penises, and if they wanted it to be a girl, they could simply push the penis in and it would leave the hole... and when it grew, the breasts puffed out because of more space being taken up inside.
A childhood belief about rude bits

others believed things like this
- I used to believe that I was older than my brother because I was born in June and he was born in OctoberAnon
- i used to think boys were born from men and girls were born from women— swag lad123
- i believe that if im born in december im older then people born in may— runawayfox16
- When I was a child I used to believe that the the babies were born from the seeds. — Rosimeire
- Ironically my parents were born on the same day; so growing up, I thought all parents had the same birthdays. Anon
- When I was a child I used to belive that fairies were born from the flowers.— fantasy