IRCT2017041633471N1 IRCT 2017-09-27 Vice chancellor for research,Arak University of Medical Sciences Comparing the effect of prone and supine positions on arterial blood oxygen saturation and vital signs of premature newborn Comparing the effect of prone and supine positions on arterial blood oxygen saturation and vital signs of premature newborn 2017-09-16 anticipated 22 Complete https://irct.ir/trial/25799 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Crossover, Purpose: Supportive, Other design features: In this study, after selecting the samples based on inclusion criteria, the samples will be placed in the two intervention and control groups with paired block randomization. In addition to arterial blood oxygen concentration, at the same time premature newborns` vital signs such as respiratory rate, heart rate and body temperature will be monitored and documented. N/A Sleep state to the abdomen and back. Intervention 1: Second Intervention:sleep newborn on supine position for 3 hours. Intervention 2: First intervention: Sleep newborn on prone position for 3 hours.