My parents had two friends who were unable to have children. They were both very fat, so I thought that they couldn't reproduce because their large bellies prevented them from getting close enough to each other to have intercourse. Of course it turned out to be a fertility problem...
A childhood belief about reproduction

others believed things like this
- In my second grade class everyone thought that sexual intercourse was "TALKING DIRRTY".— Israel Bliss
- when i was little i thought every time i left the room my parents turned into aliensAnon
- When I was first told about intercourse, I didn't believe it. How could peeing inside a girl make a baby?— Art
- that when I grew to be an adult my parents would be children.— Rainbow
- i used to think only children whose parents don't want them anymore goes to childcare centre.— Long long ago
- i used to believe that parents do things to make there children happier. well i was wrong. — Emma C.