The development and use of a large variety of nonivasive respiratory monitors have provided the neonatal intensive care unit clinician with invaluable tools for continuous monitoring. Thorough understanding of how each monitor functions, what it measures, and factors that contribute to monitor errors and injuries is vital for appropriate use of this technology and for proper interpretation of monitor values. On-going patient assessment and a good understanding of physiologic principles affecting respiratory status and monitoring also are imperative to interpreting monitor values. Noninvasive monitors have raised a controversy about home use of monitors to prevent sudden infant death syndrome--a review of National Institute of Health recommendations is helpful when cardiorespiratory monitoring is an issue. Family teaching and support are beneficial for discharge planning.