The experimental group neonates received facilitated tucking under the radiant heater after birth of the NICU as well as the routine interventions.

The control group underwent the routine interventions of the observation unit of the NICU. The group did not receive any other intervention

The nurse placed the neonate in the facilitated tucking position by rolling up a sizeable sterile towel in a U-shape and covering it with covers available in the unit and then placed the neonate in a supine position. The physiological parameters at admission and in the 15th and 30th minutes of facilitated tucking were recorded. In the 30th minute of facilitated tucking, the researcher and the observer nurse completed the COMFORTneo simultaneously but separately. The neonate was in the facilitated tucking position until delivered to its mother. The researcher and the observer nurse had a full view of the neonate's face and body when completing the COMFORTneo, which took them about two minutes. After the neonate stabilized (within the first half an hour to an hour), it was delivered to its mother for breastfeeding based on specialist consent. The first breastfeeding was performed and completed the LATCH by researcher and the observer nurse.

The descriptive characteristics form was based on a literature review conducted by the researcher (Axelin, Salanterä & Lehtonen, 2006; Kucukoglu, Kurt & Aytekin, 2015; Yin, Yang, Lee, Li, Hua & Liaw, 2015). Heart rate (min), oxygen saturation (SpO2%), body temperature (°C), and respiration rate (min) was measured at admission to the NICU at 15th minutes

Heart rate (min), oxygen saturation (SpO2%), body temperature (°C), and respiration rate (min) was measured at admission to the NICU at 30th minutes.

The COMFORT behavior scale for neonates (COMFORTneo) is a Likert-type measure of sedation and comfort needs, and pain and distress levels in NICU neonates. Van Dijk et al. (2009) established the validity and reliability of the COMFORTneo to measure only behavior in neonates. Kahraman, Başbakkal, and Yalaz (2014) adapted the scale to Turkish.

In the 30th minute of facilitated tucking, the researcher and the observer nurse completed the COMFORTneo simultaneously but separately. The neonate was in the facilitated tucking position until delivered to its mother. The Intraclass Correlation Coefficient (ICC) was calculated to check the inter-observer agreement. The results indicated a perfect inter-observer agreement. The researcher and the observer nurse had a full view of the neonate's face and body when completing the COMFORTneo, which took them about two minutes.

The LATCH breastfeeding diagnostic form was developed by Jensen, Wallace, and Kelsay (1994) and adapted to Turkish by Yenal and Okumuş (2003).

Each letter of the acronym "LATCH" denotes a criterion for breastfeeding assessment: Latch onto the breast (L), audible swallowing (A), type of nipple (T), comfort (C), hold/help (H). The items are scored on a three-point Likert-type scale.

After the neonate stabilized (within the first half an hour to an hour), it was delivered to the mother for breastfeeding based on specialist consent. The researcher and the observer simultaneously and independently observed the mother breastfeeding and completed the LATCH. The first breastfeeding was performed when the neonate was awake and active.