Babies are born by opening a door on the mother's stomach (for which the belly button is the knob) and walking out.
A childhood belief about giving birth

others believed things like this
- That the belly button was the place where babies where born from.Anon
- I used to think that women had a secret door on their stomach that babies opened when they were bornAnon
- When I was very little I used to believe that when babies were born they came out of the mother's stomach.— Aerith
- I used to believe that babies came out through the mother's belly and they sewed up the stomach afterwards.— Lucy
- babies come out of your belly button— Kit
- When i was between the age of 3-7 i used to bleave that babies came out of your belly buttonAnon