I remember when I was about 4 (my sister was a baby about 1 year old) that babies were born wearing those little sleepers- pink for girls and blue for boys.
A childhood belief about reproduction

others believed things like this
- I used to believe that babies were born wearing clothes - a red top and denim shorts. Anon
- I used to believe all babies came out as girls and later on in life some of those girls turned into boys — Tom
- i used to think boys were born from men and girls were born from women— swag lad123
- I used to believe that boys had boy babies, and girls had girl babies.
That was when I was 3-7. I'm 15 now.— Stefanie Michelle - When I was 5 I thought that baby boys came from men and baby girls came from women...— Gaz
- I used to believe that men had baby boys and women had baby girls.— Janis Smith