I used to believe that babies were conceived by means of saliva.
A childhood belief about getting pregnant

others believed things like this
- I used to believe that the foam that sometimes washes up on the beach was shark saliva... — Tiffany
- I used to believe that boys had boy babies, and girls had girl babies.
That was when I was 3-7. I'm 15 now.— Stefanie Michelle - I used to believed that "approximately" actually means "important".Anon
- I, to this day, believe that when I can't sleep at night it means I'm awake in someone else's dreams... — Turner
- Pressing on the gas pedal means that your car can do anything...including going up a vertical wall.Anon
- I used to belief that babies came from babies r us.— Honey