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There are immune system benefits to vaginal delivery which is primarily about the the transfer microbiota from the mother to the child.

I am not disagreeing with anything you are saying, but often these are often conflated.

https://www.phind.com/search?cache=f5pj4u7f9v0y8ri853qmaxg1



What is the primary source of the bacteria? Is it somehow the vagina/labia itself?

It seems C-section would have about as much overall fluid exchange, if not more.


I believe some of it is from the rectum, which you wouldn’t get from a c-section.


No, it's the vagina itself which is heavily colonized with bacteria (lactofermenting bacteria and friends). With a C-section you're removing the baby directly from the amniotic sac into the world.




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