What are the parenting superstitions your grandparents believed in that you as parent practice as well?

My grandma used to make tiny bags filled with "sharp items" like safety pins, a foldable scissors and dried chillis. She would then place these bags near where baby sleeps (but not too close in case baby grabs at it). It could be tucked inside a soft toy or simply at the corner of the crib. Old people in my culture believe that this will ward off evil spirits or entities that prey on young babies. She also made my mom carry the same pouch when she was pregnant for the same reason. If my mom wants to do the same for me and my babies, I'll be okay with it. I'm quite superstitious and when it comes to baby, best to be safe than sorry.