Inclusion Criteria:  newborns between 24 hours and 7 days of life before discharge from the maternity hospital, born at term (37 weeks of gestational age) at the Grenoble University Hospital, whose parents speak French whose parents are beneficiaries of social security whose parents did not object to participating in the study.  Exclusion Criteria:  Newborns with  a pathology requiring or having required examinations, a hospitalisation or other during the first 24 hours, which could have impacted on the exposure of the newborn to the mask parents suffering from Covid during the maternity stay will not be included in the study.