For babies with jaundice, blue light is an effective means to reduce the yellowing, but there may be adverse reactions, and if the eyes and perineum are not covered, there may be side effects on the retina or genitals. 1. Retina and genitals: If the eyes and perineum are not covered when a jaundiced baby is exposed to blue light, it may have an effect on the baby’s retina and may increase the risk of squamous carcinoma of the external genitalia in male babies. Therefore, the baby’s eyes and perineum should be covered when irradiating the baby with blue light according to the doctor’s instruction. 2. Adverse reactions: jaundiced babies may have adverse reactions when irradiating blue light, the more common fever, diarrhea, rash, some children may have bronze, that is, the skin is greenish, like the color of bronze, all of these and blue light irradiation is related to, but they are transient, may appear in the irradiation of blue light, and once the irradiation of blue light stops, will be recovered by themselves. If your baby has jaundice and needs to be exposed to blue light, make sure you do it in a regular hospital and don’t irradiate yourself at home to avoid adverse consequences.