During stay in the neonatal intensive care unit, newborns requires various treatments administered intravenously. The hidden fluid intake associated with these infusion can lead to fluid overlad, increasing the risk of complications.This study aims to describe the variation of hidden fluid intake associated with treatment infusion, develop a new care protocol for the administration of intravenous medication in the neonatal intensive care unit, and finally standardize care practices related to the infusion of medication to improve the safety and quality of care for newborns.