[folli]

I'm not at all disagreeing with you, but your examples also demonstrate that a lot of parental advice rely and reflect the era's zeitgeist.

How do we make sure that what you call 'correct advice' is not again a reflection of today's zeitgeist and 50 years from now will make fun of these suggestions in a similar way as of applying antibacterial before breastfeeding?

[thriftwy]

We don't, and that's why we should encourage parents to diversify their approach as opposed to doing the same set of things mandated from the above.