Neonatal jaundice is one of the most common symptoms in newborns, and it is divided into physiological jaundice and pathological jaundice. In cases of physiological jaundice, the baby is generally in good condition, the onset does not occur very early, and the duration is not very long, generally requiring no special intervention. If the jaundice progresses more quickly, it usually peaks around the fourth or fifth day for normal babies. At this time, if parents are concerned, they can appropriately expose the baby to sunlight. Sunlight has a certain effect on reducing jaundice by irradiating the skin. It is generally required that the skin be exposed directly to the sun without going through glass, ideally when the sunlight is not too strong, the external air temperature is not too low, the wind is not too strong, and the weather is good. Generally, the baby should lie in the sun with skin exposed, and some may choose to lie on their backs, but it is important to protect the eyes from direct sunlight. Another method is to let the baby lie on their stomach to expose their back and buttocks to the sun. The duration of exposure should not be too long. If the skin shows obvious redness, it should be stopped immediately, as strong ultraviolet rays could potentially cause sunburn, which might lead to discomfort for the baby. Therefore, when exposing a newborn with jaundice to sunlight, parents should be careful not to overdo it, and also make sure the baby does not get too cold.