Analysis of Variance
Birth Weight
Case-Control Studies
Chi-Square Distribution
Child Development
Egypt
Enteral Nutrition
Female
Hospitals, Pediatric
Humans
Infant Behavior
Infant, Newborn
Infant, Premature
Intensive Care Units, Neonatal
Longitudinal Studies
Male
Nutritional Requirements
Pacifiers
Reference Values
Sucking Behavior
Weight Gain
behavior
developmental care
heart rate
non-nutritive sucking
oxygen saturation
preterm infants
sleep
wake