I figured out at around the age of six that married women had babies and unmarried women didn't. What I couldn't work out was how in the world the babies knew in advance which was which?
A childhood belief about reproduction

others believed things like this
- I used to believe that Labor Day was when all women had their babies!— Taralyn
- When my sister was little, she believed that women had babies and men had poodles!— Sarah P
- I used to think that if a women had a large chest she had babies inside them.— Emily
- I used to belief that women had babies by pressing their belly buttons!— amy
- when i was 10 years old i believed that women who had twin babies had slept with 2 menAnon
- I used to think that women had a secret door on their stomach that babies opened when they were bornAnon