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https://www.rutgers.edu/news/hidden-reason-children-born-c-section-are-more-likely-develop-asthma https://www.rutgers.edu/news/hidden-reason-children-born-c-s... https://www.sciencedaily.com/releases/2009/06/090629081443.htm https://www.sciencedaily.com/releases/2009/06/090629081443.h... https://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/labor-delivery/csections-can-affect-a-babys-immune-system.htm https://health.howstuffworks.com/pregnancy-and-parenting/pre... https://www.telegraph.co.uk/science/2019/09/18/gut-bacteria-caesarean-babies-found-abnormal-bringing-fears/ https://www.telegraph.co.uk/science/2019/09/18/gut-bacteria-... Hundreds of papers on this topic.