Neonatal care is a critical aspect of healthcare, and monitoring the health of newborns is essential for their well-being. One indispensable tool in neonatal care is the pulse oximeter. This device plays a crucial role in assessing the oxygen saturation levels in a newborn's blood, providing vital information for healthcare professionals to ensure proper oxygenation and detect potential health issues early on. A pulse oximeter is a non-invasive medical device designed to measure the oxygen saturation levels in the blood. It accomplishes this by emitting light through the skin, which is then detected on the other side. Hemoglobin, the protein in red blood cells that carries oxygen, absorbs different amounts of light depending on its oxygenation level. By analyzing the light absorption, the pulse oximeter calculates the percentage of oxygen in the blood. pulse oximeters are indispensable tools for monitoring the oxygenation status of newborns. These devices provide healthcare professionals with valuable information to ensure timely intervention, promote optimal oxygenation, and enhance overall neonatal well-being. As technology continues to advance, pulse oximeters play a crucial role in improving the quality of care for the tiniest patients in the healthcare system.