As a child, and I don't know where this came from, I believed that a man and woman had to have sex for 9 hours in order to make a baby, and a woman wasn't really pregnant unless she had the telltale belly.
A childhood belief about getting pregnant

others believed things like this
- I used to believe that when a woman was pregnant, she fed the baby with a tiny spoon through her belly button.— Marie
- When I was younger I thought that when a woman was pregnant she would feed her baby through her belly button!— Hennie
- I used to believe that a woman gave birth by pressing her belly button and the baby popped out.
— Tasha K - My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne
- I used to believe that when a woman was pregnant the baby could play monkey bars on her ribs.— Laura
- I used to think that if a black woman or man and a white woman or man had a baby, it would be Asian.Anon