If you read the article, the study was done in context of other studies showing that most of the gut bacteria comes from vaginal birth, e.g http://www.mdpi.com/

If you read the article, the study was done in context of other studies showing that most of the gut bacteria comes from vaginal birth, e.g http://www.mdpi.com/2076-0817/3/3/769/htm http://www.mdpi.com/2076-0817/3/3/769/htm Correlation between healthy gut bacteria and lower obesity rate are not that surprising.