When I was a kid I use to think that the color of the blanket (Blue or pink) that the doctor wrapped the baby in determined the sex.
A childhood belief about giving birth

others believed things like this
- I believed that 4 p.m. was pink, and 5 p.m. was blue. I don`t know why.— blue
- I used to believe that a baby's sex was determined by whether the sperm had a picture of a man or woman on it.— David E.
- i used to believe that people with blue or green eyes saw that certain color— mellactica
- I used to think that blue was a natural hair color but it as very rare, even rarer than ginger.Anon
- i knew that if you ate beets your urine would turn pink and i thought if it was pink, then you could drink it.— JP
- I thought pink lemonade came from pink lemons.Anon