The purpose of this study was to determine the effect of applying M method on physiological, behavioral and weighing criteria in preterm infants admitted to the neonatal intensive care unit. This is a randomized clinical trial study. The population of this study included infants with fetal age of 28 to 37 weeks admitted to the intensive care unit of newborns in selected educational centers affiliated to Iran University of Medical Sciences. After the samples are selected, a written consent will be obtained from the parents of the infants, and the demographic data of these infants will be collected and recorded. Then, newborns are randomly assigned (blocked blocks) in the test and control group. All of the infants in the control group and the usual evolutionary care exam in the neonatal intensive care unit, such as skin contact, parental presence, neuropsychiatric assessments provided by a physician and clinical occupational therapist, use of conditional support and cyclic care Sleep and awakening. Neonates in the test group will receive M-massage as well as these treatments. In this study, 70 premature infants (28-30 weeks of age and birth weight 800 to 1400 g), normal abnormalities, cardiac abnormalities, chest tube, intracranial hemorrhage of more than grade 2, septic shock, Damaged skin, respiratory failure, tachycardia and persistent bradycardia.