New research being presented at this year's European Congress of Clinical Microbiology & Infectious Diseases (ECCMID) in Amsterdam, the Netherlands (13-16 April), suggests that mode of delivery influences the development of the microbial composition of the gut (i.e. the gut microbiota) in infants, independently of a mother's use of antibiotics. This, in turn, may affect infants' respiratory health during the first year of life.
source https://www.lifetechnology.com/blogs/life-technology-news-blog/mode-of-delivery-alters-infants-gut-microbiota-and-this-may-impact-respiratory-health-in-first-year-of-life