I used to believe that babies came out of your belly button, and that's why we had them (I didn't take into consideration the fact that men also had them!)
A childhood belief about belly buttons

others believed things like this
- babies come out of your belly button— Kit
- when I was a kid I thought that babies come out of a belly-button.— Ana
- That the belly button was the place where babies where born from.Anon
- I used to think that babies were made when you press your mums belly button.
Then a baby would fall out— Chris Hyndman - I used to think that if i touched my belly button it would unfold and my belly would be inside out forever. Anon
- When I was a kid my dad told me that if you unscrewed your belly button your bum would fall off.— Ann