Pregnant women generally have 1-2 hours of sun exposure, and it is recommended to choose 9-10 am and 4-5 pm to go outside for sunbathing. Pregnant women should sunbathe daily, and it is recommended that they do not go through glass windows to help the absorption and replenishment of calcium in the body. In fact, since the vitamin D formed in the skin from daily sun exposure can provide the daily needs of a normal person, calcium supplements can be eliminated. However, since the fetus needs vitamin D for growth and development, and some pregnant women need extra calcium supplements and light exposure so that the body can convert the calcium intake into vitamin D, trying to ensure sufficient sunlight exposure after taking calcium supplements can help promote calcium absorption. In addition, when pregnant women are in the sun, the season and time period are also matters that need to be noted, noon ultraviolet rays are too strong, pregnant women should avoid this time period; summer sun is too warm, in the process of sunbathing should be sunscreen to avoid sunburn.