In children with chronic kidney disease stage 5D peritoneal dialysis (PD) remains the dialysis modality most commonly prescribed, especially as automated PD. Nowadays it can be started from the first days of life on, and applied even to some preterm babies. This chapter gives an overview on PD membrane ultrastructure and function, on technical prerequistes of PD, on optimal PD prescription and on specific treatment targets and tools to monitor efficacy. It describes PD related infectious and noninfectious complications, long term peritoneal and systemic sequelae and current state of the art of how these can be mitigated or even be prevented.