While I understand your point, I would like to point that scientific research has found out the best methods for a lot of things regarding raising babies. Advice from our elders (what you seems to refer as 'cultural memory') is often wrong. What worked for them may not be the best thing to do, they had n=1, science has n=millions. There is a huge problem that scientific findings regarding raising babies does not get transferred well enough (if at all) to the population.

I’m talking about cultural memory and community on large scales, where generation after generation is devoted to the thriving of its community and the people in it. I think the best way I can explain it is to recommend Wendell Berry‘s essay The Work of Local Culture. I’m not saying modern science has nothing to say, but I do believe that as insightful and beneficial as it is in this context, local community and culture would be even more-so.