Also birth by c-section https://www.science.org/content/article/swabbing-c-section-babies-mom-s-microbes-can-restore-healthy-bacteria https://www.science.org/co

Also birth by c-section https://www.science.org/content/article/swabbing-c-section-babies-mom-s-microbes-can-restore-healthy-bacteria https://www.science.org/content/article/swabbing-c-section-b... "The microbiomes of C-section babies look a lot different from those of babies born vaginally. In particular, they have lower numbers of Lactobacillus, Escherichia, and Bacteroides bacteria in their guts."