i used to believe as a kid that everyone had a baby growing inside them, and when you had a stomach ache (or your stomach 'growled') that that was the baby kicking :)
A childhood belief about reproduction

others believed things like this
- I thought a stomach ache was a stomach egg— Catherine
- I used to beleive that my stomach growled when I was hungry because I was part tiger.— Matthew
- I used to believe that when my stomach growled I was pregnant with kittens and I could hear them purring!— Angie
- I used to think that growing pains meant that a tomato plant was growing in your stomach.— Annette
- I used to believe that if you swallowed cherry pits, you would have a tree growing in your stomach.— porkchop
- My dad always told me never to swallow the pips from apples because trees would start growing in my stomach!!— ALISON W