Obtaining the approval of the research plan by the ethics committee and obtaining permission from the joint organizational ethics committee of the Faculty of Nursing and Midwifery, Tehran University of Medical Sciences.
Refer to the neonatal intensive care unit of Waliasr hospital and introduce yourself to the relevant authorities and families participating in the study .
Obtaining informed consent from the parents of infants participating in the study and explaining the objectives of the study Selection of samples according to the inclusion criteria