Inclusion criteria:
1. Be born between 28 and 32 weeks of gestation.2. Receive nutrition through the tube3. Their birth weight is between 1000-2000 grams4. Have physiological stability (stability in spo2, Hr, RR) at the beginning of nutritional stimulation.5. Oral stimulation and the onset of feeding in these infants do not alter the autonomic system [skin color, heart rate, or respiration rate].6. Apgar score above 6 in 5 minutes7. Newborns without congenital anomalies and obvious chromosomal abnormalities8. No oral lesions such as candidiasis9. No lip and mouth abnormalities such as cleft lip and palate
Exclusion criteria:
1. NPO of the baby in case of symptoms such as fever, respiratory distress, muscle stiffness, frequent vomiting for one day and more2. Diagnosis of cases such as intraventricular hemorrhage, necrotizing enterocolitis, open arterial duct, sepsis, acute lung disease or severe anemia by a physician during the days of interventions3. The need for surgery during the days of interventions4. Transfer the baby to other centers5. Infant death6. Lack of cooperation of the mother in performing the interventions7. Maternal addiction8. Physiological instability (spo2, Hr, RR) during a day and night so that he can not receive one pumice massage or two field massage.