Inclusion Criteria:  The baby is receiving phototherapy due to physiological hyperbilirubinemia, Being a term newborn, Monitoring of the LED group in the incubator and the tunnel group in the tunnel phototherapy device, Parents' consent to participate in the study.  Exclusion Criteria:  Rh incompatibility between mother and baby, Finding ABO non-compliance, Positive direct Coombs test, Presence of congenital anomaly or syndrome, Any surgical intervention has been or will be made, Having any skin lesions, The need for mechanical ventilation.