Assessment of Autonomic Regulation During the Listening of Mother Heart Beat in Newborns

Record of maternal heart sounds (heartbeats) with an electronic stethoscope during 10 minutes.

Each newborn included will have 20 minutes of an acoustic listening of their mother heartbeats previously recorded.

"Recording of the newborn's heart rate: one hour before the acoustic listening, during the acoustic listening and one hour after the acoustic listening .~The variations of the autonomic nervous system will be analyzed.~An coupled Heart rate variability recording (ECG signal obtained from a Philips® IntelliVue MX700 monitor) and NIPΣ index of comfort (MDMS® NIPΣ monitor) will be used."