50 Terrible Advice for Parents that your grandma thought were true
Smoke While Pregnant
Not only smoking while pregnant was seen as normal, but it was also encouraged, from advertisements like the one seen above to medical textbooks that claimed that enjoying a pack a day while pregnant was ok.
Potty training beginning at 2 months old
It's hard enough to potty train a 2-years-old, imagine a two-months-old! This nonsense idea was popular in the 19th and early 20th century because it was believed that controlling the bowels avoided diarrhea infections.