Inclusion Criteria:  The preterm infants whose parents agree to participate in the research and sign the informed consent form; Who have no congenital anomaly; Who have no chronic disease; Who have undergone no surgical procedure; Who have no neurological symptoms; Who have no NEC (necrotizing enterocolitis) diagnosis; Who are not sedated; Who are not hypoglycemic; Who have been administered no pharmacological analgesic method 4 hours before; Who are born between ≥28 and ≤36+6 gestation weeks, or are in between ≥28 and ≤36+6 gestation weeks during the procedure.  Exclusion Criteria:  The infants whose parents do not agree to participate in the research and do not sign the informed consent form; Who have a congenital anomaly; Who have a chronic disease; Who had undergone a surgical procedure; Who have neurological symptoms; Who have NEC (necrotizing enterocolitis) diagnosis; Who are sedated; Who are hypoglycemic; Who have been administered no pharmacological analgesic method 4 hours prior; Who were between <28 and >36+6 gestation weeks.