The time of sunshine for calcium is generally controlled at about half an hour, for patients who want to sunshine for calcium, they also need to combine the intensity of ultraviolet rays, the time of sunshine and the change of seasons to choose a suitable time for themselves. 1, ultraviolet intensity: generally in high altitude areas or at noon ultraviolet rays are relatively strong, in such areas or this time, it is recommended that patients sunshine for about 10 minutes The actual sunlight is usually a good way to get a calcium supplement, so as not to cause skin damage and aging due to excessive sunlight time. In low altitude areas the sun’s ultraviolet rays are generally not too strong, sunbathing time within half an hour, can play a certain calcium supplement effect; 2, the time of sunshine: generally speaking 6-10 am sunshine is more adequate, infrared rays are stronger, ultraviolet rays are weaker, you can properly supplement calcium. In addition, in the afternoon at 4-5 pm light is more abundant, and can cause damage to the skin of ultraviolet light is weak, is a good time to supplement calcium to promote bone development; 3, the change of season: summer light is more abundant, the daylight duration is longer, for the temperature of about 35 ℃, the appropriate 10-20 minutes of light can accelerate the calcification of uncalcified bones, and thus play a calcium supplement effect. It should be noted that the temperature should not be too high, so as not to trigger heat stroke. The opposite is true in winter, when it is mostly rainy and snowy, the light is weak and travel is inconvenient, so it is a better time for sunbathing in summer. To sum up, it is best to choose the sun for calcium in the morning or afternoon of low altitude summer, within half an hour, so that not only can play a certain calcium effect, and can also kill bacteria and viruses on the surface of the skin, promote metabolism, improve the body’s immunity, and prevent the occurrence of some diseases. It is important to note that younger babies have delicate skin, so try to avoid direct sunlight when sunbathing for calcium to avoid burning the skin. After sunbathing, parents should give their babies timely hydration.