I believed that if you held your breath, then your heart would stop during the time that you were holding your breath ... and start again when you started breathing.
A childhood belief about general

others believed things like this
- I used to dream that if I held my breath, I could swim through the air for brief amounts of time— Adam
- when i was a little kid. i used to think that when u hold ur breath ur heart stops.. LOL :P — Annonymus
- I used to think that if you held a turd in for more than an hour it would give you bad breath— phil
- I held my breath near cemeteries because I thought it would be rude to inhale spirits. Anon
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- When i was litle i used to think i only had to breath when i wanted to.— molly