Effects of Clustering Care on the Physiological Stability of Preterm Infants.

Inclusion Criteria: * between 26 to 31 6/7 weeks of gestation at birth * more than 72 hours of life, * receive a respiratory aid such as endotracheal tube, NIPPV (non invasive positive pressures ventilation), CPAP (continuous positive airway pressure) or nasal prongs with oxygen, * are fed intravenously (IV) or by central venous catheter (CVC), * one of the parents speaks and reads English or French, * one of the parents is at least 18 years old to sign the consent. Exclusion Criteria: * severely ill (necrotizing enterocolitis, septicemia), * under respiratory assistance or on a high frequency mode, * having a congenital or cardiac abnormality, * requiring surgery, * sedatives or opioids, * diagnosed with grade II, III or IV intraventricular hemorrhage and / or hydrocephalus, * have a device for invasive blood pressure, * having an oxygen requirement of more than 30% to maintain oxygen saturation within the limits indicated by the NICU (neonatal intensive care unit). * one of the parents is at least 18 years old to sign the consent.