New research presented at this year's European Congress of Clinical Microbiology & Infectious Diseases (ECCMID) in Amsterdam, Netherlands (13-16 April) shows that the early microbiome (population of gut bacteria) in newborn babies is able to predict the risk of the child subsequently becoming overweight. These gut bacteria can also be affected by maternal antibiotic use during pregnancy.
source https://www.lifetechnology.com/blogs/life-technology-news-blog/microbiome-of-babys-first-stool-is-associated-with-overweight-at-age-3-years