In this group, preterm infants will be recorded with a camera for 20 minutes between 13:00-13:20, 19:00-19:20, and 01:00-01:20, after their routine care and feeding have been completed, with no interventions applied to the baby.

Researchers will schedule a time with the mother within 48 hours after the baby's birth to record the heartbeat. The recording of the mother's heartbeat will be done when the mother's mood is stable and the environment is quiet. A Doppler fetal heart monitor will be used to detect the mother's heartbeat. After ensuring a regular and stable heart rate, the mother's heartbeat will be recorded for 15 minutes using a recording device.

GHT will be applied to the babies at the designated times.

For this group, maternal heartbeat will be played and GHT steps will be applied simultaneously at the designated times. Camera recording will start 2 minutes before the intervention and continue for an additional 2 minutes after the intervention.

the trained NICU nurse will place one hand's fingertips on the baby's forehead along the brow line, while the other hand will be placed around the baby's lower abdomen

It is a Likert-type scale consisting of seven parameters: alertness, calmness/agitation, respiratory response, crying, body movements, facial tension, and muscle tonus. As well as determining comfort, the COMFORTneo scale is a tool that includes numeric rating scales, which allow nurses to assess the pain and distress of the infant. The lowest score on the scale is 6, and the highest is 30. If the total score on the scale is between 14 and 30, the infant has pain or distress, is uncomfortable, and needs intervention to provide comfort. In addition, 4-6 points indicate moderate pain and distress, and 7-10 points indicate severe pain and distress

It developed by Anderson et al. in 1990, evaluates the baby's sleep-wake states through 12 categories of behavioral states. ABSS involves 12 categories, including measuring the extent of eye openness, patterns of respiration, body movement, muscle tension, and crying with or without sound, to assess the behavioral state of term infants as well as premature infants.

Categories 1-5 pertain to sleep states, 6-8 pertain to wakefulness and calmness, and 9-12 pertain to discomfort and distress. High scores indicate negative behaviors, while low scores indicate positive behaviors.