The requirements for light mainly include avoiding too bright or too dark, avoiding direct sunlight on the eyes, and keeping light during the day and dark at night. First of all, the indoor light should avoid too bright or too dark, so that infants can gradually learn to adapt to the external environment under natural light. Too much light can cause some irritation to the baby’s eyes, which can lead to retinopathy in the long run. Too dark light is not conducive to the development of infant vision, but can also lead to its sensitivity to light decreased. Secondly, for the choice of indoor lights, it is recommended to choose a soft light, low wattage, so as not to stimulate the baby’s eyes at night. During the day, babies need to be in a bright environment, and at night, the environment should be kept dark to help babies adapt to the natural rhythm of circadian changes, which is beneficial to their growth and development. At the same time, the exposure of infants to sunlight during the day is beneficial to calcium absorption, so as not to affect infant bone development or increase the chances of rickets. However, care should be taken to avoid direct sunlight on the infant’s eyes, as infants are not well developed in all aspects, and prolonged exposure to ultraviolet light can cause damage to vision development, so appropriate shading can be done when going out to prevent direct sunlight on the infant’s eyes. In addition, parents should be careful not to turn on the flash when taking pictures of their babies.