Not me but my sis.
Me, my mum, her heavily pregnant friend and my sister were getting changed to go swimming.
My sis points at my mum's friend just as she's slipping into her cossie and says,
"It's going to be a girl!" we all asked how she knew. (she's a lot younger than me) "I can see her hair sticking out!!!!"
We all had a good laugh at my sis expense.
Incidentally, it was a girl.
A childhood belief about reproduction

others believed things like this
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg
- My sister's friend thought cats were just small dogs when she was younger.— Richard Davies
- My friend's mom told my friend's little sister thatI when a dog died, it went to a retirement home.— ellen
- A girl could get pregnant going to the bathroom after a boy.— Brandy Gallop
- when i was 7ish i used to think that you got a girl pregnant by peeing in them— nick
- i used to believe a girl will pregnant if kissing a boy on the face— mulan