When I was a kid, I used to think that a girl's period was her nipple because a nipple looked like a period!
A childhood belief about periods

others believed things like this
- I thought that to breastfeed, a woman had to poke a hole in her nipple (like the hole in a bottle nipple).— Imani B.
- when i was young i used to beleive that the bumps around your nipple was brale for suck here.— Becky
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen
- up until puberty I thought that my nipple would inflate like a balloon to form a breast— EiEi
- I used to believe that you had to be on your period to get pregnant........— Tricia
- HA! I used to think when you got your period, you would just pee blood...I wish it was like that...if only.Anon