<qa>  How many days will the blood be taken from all patients at -80 C after centrifThis study will be conducted on 60 patients who are 1-28 days-aged, below 1500-gram body weight, born before 32 weeks of gestational age and diagnosed and followed in Neonatal Unit of Pediatrics Department of Medicine Faculty of Yüzüncü Yıl University. For 45 days, 30 patients will receive eoprotin as breast milk fortifier while another 30 patients will receive olive oil, then 3 cc of blood will be taken from all patients at 0, 15., 30. and 45. days into biochemistry vials and will be stored at -80 C after centrifuge. At the end of the study, vials will be thawed in room temperature and serum TNF-alpha, IL-1 Beta, IL-6, IL-8, IL-10 levels will be analyzed with ELISA method by BIO-Tec ELx800 Absorbance Reader device and lipid profiles LDL, HDL, Total cholesterol and triglyceride and levels will be analyzed with spectrophotometric method by Architect ci16200; then these parameters will be compared with each other. 