Crib Care
Babies are not supposed to sleep on their stomachs. Do you think boomer parents knew that? Absolutely not. They also had very unstable cribs which were built more for the style than safety and function. Since then, the crib industry definitely prioritizes a safe baby, not a fashionable one.
Mercurochrome
There's a reason most kids haven't heard of Mercurochrome. If a little kid ever scraped their elbow or cut a finger playing, Mercurochrome was the chemical in question to stop infection. We don't use it anymore because it was bright red which is a little too creepy looking...