My mum is pretty sensible but I've heard other old wive's tales such as not raising your arms above your head when pregnant in case th cord wraps round the baby's neck, and that if the mother gets frightened by anything during pregnancy, the child will have a birthmark of that shape.
I did have to wear a liberty bodice, which I hated, but as we had only one fire in our entire house, it was probably a wise move!
My grandad used to say you could cure any cough with a generous dose of syrup of figs. 
Remember Kaolin & Morphne mixture, too? And Parrishes food tonic had ?cyanide in it!