Not walking under a ladder is the only one I remember being at all a ‘thing’ when I was growing up.
I came across several old wives’ tales, though, when a bit older. First, my German exchange girl’s mother was adamant that you couldn’t have a bath or wash your hair when you had your period.
TBH I was amazed in that day and age (60s) - my own mother had never mentioned such nonsense. Of course I quietly took zero notice of ‘Mutti’ while staying with them, but the younger daughter once had a proper tantrum at the dinner table because she wasn’t allowed to wash her hair!
Later, living among mostly Greek Cypriots in the Middle East, I was told that if I went swimming while pregnant, ‘your bones will open and you’ll lose the baby’. Also, that if I went on carrying dd1 on my hip while obviously pregnant, my baby would be born with a broken arm. 😱
Plus of course if I took the baby out after dark, I must cover her face to keep the evil spirits away!
All decades ago now, I doubt whether younger women still believe all this stuff.