One thing is you put Vick’s vapor rub on your socks and feet. It’s supposed to help clear up congestion. I heard about it when my daughter was a baby, because I couldn’t give her cold medicine. You’re supposed to put menthol on their feet with socks on, because you can’t put it on their chest.
I had not heard of this, but this sounds like folklore that would be shared more with new parents or babysitters.