I used to believe that babies were born with teeth and that was why they were fed with bottles. To nurse a baby was old fashioned, not to mention very painful for the mother. In the early sixties, in the Seattle-Tacoma region, all the babies I saw were bottle fed.
A childhood belief about reproduction

others believed things like this
- 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 were born out our bellybuttons.Anon
- I don't know why, but I used to believe that babies were one year old when they were born o_O.Anon
- I used to believe that babies were born through the mom's mouth.
Don't know how I came up with that. — Makenna - I used to believe babies were born with clothes onAnon
- I used to believe babies were 9 months old when they were bornAnon