Catheter-related bloodstream infections (CRBSIs) are a major cause of morbidity and mortality in infants admitted to the NICU. In adults, chlorhexidine used as a skin antiseptic has been shown to reduce the incidence of CRBSIs, and recent evidence indicates the inner surface of long-term central catheters as the likely route of infection. This study will evaluate 3.15% chlorhexidine as the daily catheter hub antiseptic to reduce catheter tip microbial colonization, an indication of high risk for acquiring CRBSI. The purpose of this study is to compare the antiseptic capability of 3.15% chlorhexidine versus isopropyl alcohol in reducing central catheter-related infections in neonates. This study also aims to compare the time to catheter hub microbial colonization in the two groups and to determine the route of catheter tip colonization by comparing cultures taken from the catheter tip, hub, and skin insertion site.