I grew up an extremely sheltered and overprotected girl. One day, when I was perhaps in 6th or 7th grade, my father and I were discussing some aspect of nature and survival. Figuring I was just being logical (and not knowing their true function), I told him a woman's breasts were there as extra fat to provide nutrition should the woman become malnurished or not have enough to eat. My father just laughed and explained their true function was to feed babies. So I asked where the breasts were on animals (since they don't protrude), and he explained how some animals had them inside rather than out.
A childhood belief about rude bits

others believed things like this
- When we were young, we used to call a woman's breasts, 'Hum Hums'— Steve Haughton
- I used to believe that babies came from between/underneath the breasts.Anon
- I used to believe that Marilyn Manson was a extremely scary woman!— Tim_NOrway
- I thought that only the mother made the child, the father was an "extra" in this area— Lea Weiss
- 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 after I cut my stuffed animals hair that it really grew back! — Kristy