Follow-up of the Nasal Microbiome and Viral Infections in Newborns Hospitalised in Neonatology.

The goal of this interventional study is to learn about nasal microbiome and viral infections in newborns hospitalised in neonatology. The main questions it aims to answer are : * how often are newborns infected by viruses in neonatology ? * how does the microbiome develop during first weeks of life ? * how does microbiome and viruses interacts together ? * is there a link between viral infection, microbiome, and medical complications during hospitalisation in neonatology ? Participants will have a nasal swab taken each week during their hospitalisation in neonatology, and researchers will take medical data from the medical chart.