 Investigators aims to compare post-nutritional immunologic parameters of 1-28 day-aged 60 infants with 1500 g birth weight and 32 weeks of gestational age who were fed with maternal milk that is fortified with eoprotin and olive oil and diagnosed and followed-up in Neonatal Intensive Care Unit of Pediatrics Department of Medicine Faculty of Yüzüncü Yıl University. 