When i was in 3rd grade, my friend told me that when you had a period it came through your nipples in your breasts.
A childhood belief about periods

others believed things like this
- I used to believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- When I was a kid, I found out about a womans period and I thought that she would bleed through her breasts.— Michael
- In 6th grade, I thought that once you got your period, you'd have it forever!!!! 24/7Anon
- When I was little I thought that only little girls had nipples, and they went away when you grow up. — Cutie
- I thought nipples disappeared at a certain age because Barbie never had them.Anon
- I used to believe that ants had the smallest nipples in the worldAnon