On the 10th – 12th of October 2018, the XXXIV. Neonatology Days were held at the ALDIS Congress Center in Hradec Králové organized by the Czech Neonatology Society ČLS JEP under the auspices of the Pediatric Clinic of the Faculty of Medicine, Charles University and the University Hospital in Hradec Kralové, where the c4c project was presented in the form of a poster. The poster section was devoted to errors and mistakes in the diagnosis and treatment of newborns.