I also used to think that Mommies didn't have periods. I thought it went away once you had a baby.
A childhood belief about periods

others believed things like this
- When I was around 4 or 5, I thought babies came from seeds that daddies put in mommies bellybuttons.— gullible
- I used to think that the way mommies got pregnant was if they ate a lot.— anonymous
- i use to believe that when you died you were reborn, but you had different mommies and daddies— kimberly
- i thought the phrase "getting a boner" referred to men getting their periods. — astrid
- When my mom was a child, she thought that while girls had periods, boys had hemorrhoids!Anon
- I used to think that guys had periods, too. — Laurie