This study aims to extract and discriminate the signals of respiration, heart rate and swallowing from a standard ECG and EMG signal obtained using a special neonatal gastric tube. These signals will be compared with the standard monitoring signals in the neonatal intensive care unit (NICU). Further, they will be used to search for objectively quantifiable maturational coordination processes of respiration, heart rate and swallowing. Lastly, this study aims to identify changes in ECG/EMG-signals as a result of external stimuli (e.g. nursing interventions) in the NICU.