When I was very young, I believed that babies were born through the mother's navel. A woman in our neighborhood had a baby and her son told us all about how it happened. So I shared the navel/birth canal belief with my entire preschool peer group.
A childhood belief about reproduction

others believed things like this
- till the age of 13 i always beleived that women gives birth through her navel. hehe— Anki
- When I was little I thought the navel was a button to turn people off and on.
— James - I used to think that my belly button was where I was once shot and that the navel was a healed up bullet hole— Tony
- I used to think that to give birth, a woman had a slit cut into her inner thigh, and the baby would come out.Anon
- I used to believe that a woman gave birth by pressing her belly button and the baby popped out.
— Tasha K - When I was young, I believed that because my mother was born in New Mexico, that I was part Mexican.Anon