This Week In Wellness a new Dutch study has shown that 60 percent of a babies microbiome is inherited from their mother and that whilst babies born via caesarian section received less gut and vaginal microbes this may at least in part be made up for by a higher percentage of microbes from mums breast milk, skin and respiratory system. 

https://www.abc.net.au/news/health/2023-03-09/babies-microbiome-mothers-birth-caesarean-section/102059396

https://www.cell.com/cell-host-microbe/fulltext/S1931-3128(23)00043-4