I used to believe that babies didn't fart, but children over 6 and adults did.
However, a clip on You've Been Framed! - a UK comedy home video show - which showed a freshly powdered baby lying on its tummy and then farting a cloud of talcum powder proved otherwise!
A childhood belief about farting

others believed things like this
- I used to think that 'black comedy' was show like Family Matters and The Cosby Show.— Katie
- I used to believe that the video clip are realized in one time and the singers are singing with to the music Anon
- I used to believe that when you fart, your tummy was breathing!— Nicholas Orsmond
- I was convinced that children weren't humans, only adults were, children were a total different race!— Leda
- That adults came into the world as adults and were never childrenAnon
- I used to believe untill I was five that all adults are born like that and all little children stay little— Igor