Inclusion Criteria:  Premature newborn under 35 weeks of amenorrhea (AS), hospitalized at Besançon University Hospital, Newborn baby whose parents:  expressed their non-opposition to participate in the study, are affiliated to a social security scheme, are of age, express themselves easily in French.  Exclusion Criteria:  Newborn baby whose parents object to participating in the study, Newborns presenting severe malformative anomalies, or malformations of the oral sphere, Newborn baby whose transfer is scheduled before the end of hospitalization (excluding birthing pool at the CHU de Besançon).