I used to believe that when a man and woman had sex one of the man's balls went into the woman and the baby grew from it. Therefore I thought you could only have 2 kids. I thought that people that had more than 2 kids had stolen/bought one from someone else.
A childhood belief about reproduction

others believed things like this
- I used to think that if a black woman or man and a white woman or man had a baby, it would be Asian.Anon
- I thought the line in the song "more than a woman" was "four-legged woman".— boo
- When i was little, i thought that when i grew up i could only have two kids because i only had two testicles.— nick
- I thought that if a black man and a white woman (or reverse) had a baby it would be stripped!— Bec
- When I was younger I thought that when a woman was pregnant she would feed her baby through her belly button!— Hennie
- My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne