Prof. Dr. Nadja Haiden is a pediatrician specializing in Neonatology and Pediatric Intensive Care Medicine, as well as the Head of the Department of Neonatology at Kepler University Hospital, Linz, Austria. She was educated at the Medical University of Vienna and worked as a consultant neonatal pediatrician for almost 21 years. She helps lead a broad portfolio of research based at the MUV and the Kepler University Hospital Linz. She coordinates the PIES and PREWEAN projects that track the growth and metabolic outcomes of preterm infants after the introduction of complementary feeding. Her further major research interests relate to parenteral and enteral nutrition and human milk. Nadja Haiden has earned grants from the Austrian FWF, the Austrian National Bank, and the Bürgermeisterfonds of the City of Vienna. Furthermore, she is a faculty member of the Medical University of Vienna, head of the national committee of pediatric nutrition of the Austrian Pediatric Society, head of the national neonatal nutrition committee of the Federal Ministry of Health, and an elected chair of the ESPGHAN (European Society of Pediatric Gastroenterology, Hepatology, and Nutrition) nutrition committee.