Thomas Abrahamsson is a Professor of Pediatrics at Linköping University, Sweden. He also has a position as scientific secretary of the Swedish Pediatric Society. He is pediatrician and neonatologist by training and has a position as senior consultant at the Crown Princess Victoria Children´s Hospital in Linköping, Sweden. Since long he has studied the importance of the nutrition for health and disease in newborn infants with a focus on how the gut microbiome and probiotics in extremely preterm infants affect the risk of severe complications such as NEC. sepsis and neurodevelopment impairment. As a consequence he has also studies the importance of breast milk composition including studies of human milk oligosaccharides. Recently his research group reported the result of the N forte trial, which was a randomized controlled trial evaluating the preventive effect human milk-based fortifiers on necrotizing enterocolitis, sepsis and mortality in extremely preterm infants. The result of this trial will be presented in his lecture.