Study aim: Determining the effect of aromatherapy with rosa damascena essential oil on feeding tolerance and weighing of premature babies hospitalized in neonatal intensive care units Design: A controlled, parallel-group, unblinded, quasi-randomized, phase 3 clinical trial on 60 preterm infants. Lottery was used for randomization. Settings and conduct: The method of assigning two groups is a quasi-random clinical trial in the neonatal special care department of Imam Reza Hospital (in the form of a lottery for the first intervention or control group in two separate time periods). Olfactory stimulation in 4 times by the researcher and under the supervision of the corresponding nurse, starting with gavage in the form of a pad impregnated with the essence of the rose flower in the form of three drops on A cotton ball is applied and the gavage is completed. Participants/Inclusion and exclusion criteria: Premature babies with a gestational age of 28 to 32 weeks Birth weight below 1500 grams and at least 1000 grams Breastfeeding Not having any life-threatening congenital abnormalities No necrotizing Enterocolitis No positive blood culture and meningitis No invasive mechanical ventilation Intervention groups: Babies in the intervention group are weighed every morning with a specific scale and by the researcher. Gavage with breast milk will be done. The olfactory stimulation is performed at the beginning of gavage in the form of a pad impregnated with the essence of the rose flower in the form of three drops on a cotton ball and ends at the end of the gavage. This intervention continues for one week. Babies of the control group are weighed every morning with a specified scale by the researcher. Gavage with breast milk will be done every two hours according to the routine of the neonatal intensive care unit, and no intervention will be done for this group. Main outcome variables: Nutritional Tolerance Weighing