Babies cry all the time when exposed to blue light, which may be caused by discomfort with blue light or side effects of phototherapy. You can soothe your baby before exposure to blue light, shorten the exposure time of blue light, lengthen the interval or stop exposure to reduce crying. When exposed to blue light, babies are not accustomed to the blue light and the surrounding environment, so they often cry. Parents can soothe the baby before exposure to blue light, can use a pacifier to soothe, or in the light of blue light to the baby’s eyes covered with a better shade of cloth. If the baby keeps crying, in the absence of other clinical symptoms, you can shorten the exposure time of blue light, or lengthen the interval, or change the multi-faceted blue light irradiation to single-faceted. Blue light irradiation is the main treatment for jaundice, which is simple, effective and very safe, but there may be side effects. If the blue light irradiation of the child has been crying, accompanied by symptoms such as bronchitis, rash, it is recommended to stop irradiation immediately, and seek medical attention in a timely manner. If the baby irradiation blue light has been crying by the above methods did not relieve, it is recommended to timely consult a doctor, under the guidance of the doctor to improve the relevant examination, to clarify the cause of the disease, the line of targeted treatment.