When I was very young and still sharing a bath with my big brother, I saw his tackle and started crying. He looked at me reassuringly and said "It'll grow".
I'm still waiting.
A childhood belief about rude bits

others believed things like this
- I used to believe that my head was filled with hair waiting to grow.— Poppy
- When I was young I used to believe that when it is raining God is crying or washing dishes.Anon
- while my son was crying one day, my little brother announced that "babies cry to let off moisture". ha!— i'm laughing WITH you
- I'm autistic, and I used to believe taking some of my sister's food while she was eating it was sharing.Anon
- I used to think that when I was in the bath I shark lived under the bath and that ig might come up and bite me— ------------
- I used to think that if you take the plug out of the bath it will suck you into the bath— awesome kid