When my little sister was younger she believed in order to have babies you had to get married. So if you had two kids, you married twice. Soon after my mom found out (when she was about 9) is when she told her how couples had babies.
A childhood belief about reproduction

others believed things like this
- I used to think when you married you had babies immediately!Anon
- I used to think that people who got married had babies automaticly, unless they had a medical disorder— Angela
- I Use to that all couples got married twice to renew the marriage
— Lucas Jr fique Marti d - When I was younger, I believed that Priests could get married, but only to Nuns— MJF
- When I will little I used to believe that when you got married, you signed a contract to order a baby! LOL— Kriatina
- i used to believe nuns were married to jesus and priests were married to mary.— sunshine