About Cristina Sáez

Cristina Saez is a freelance science journalist. She works for several media, for instance the Spanish newspaper La Vanguardia, where she coordinates the science section, Big Vang; as well as research centres and scientific societies. She has been awarded for her journalistic work, among others, with the Boehringer Ingelheim Award in Medical Journalism 2015. Follow Cristina on Twitter @saez_cristina

Nature publishes the largest study ever conducted on the gut microbiota of newborns and the impact of delivery mode, with an analysis of 1,679 gut microbiota samples from almost 600 newborns and 175 mothers.