Sunlight and fresh air are indispensable for the growth of infants. Taking children outdoors frequently can enhance their physical constitution and increase their resistance to diseases. The renowned Tang Dynasty physician Sun Simiao stated in Beiji Qianjin Yaofang·Chuchu Fulu: "Infants should be exposed to wind and sunlight regularly. If they are never exposed to wind, their skin and muscles will become weak and fragile. On warm and windless days, mothers should let their children play in the sun. Frequent exposure to wind and sunlight will strengthen their blood and energy, firm their muscles, and make them resilient to cold and wind, thus preventing illnesses."
We know that it is the infrared rays in sunlight that make people feel warm. Infrared rays can raise local temperatures, dilate blood vessels, promote metabolism and tissue regeneration, and have anti-inflammatory and analgesic effects. The ultraviolet rays in sunlight are a powerful disinfectant, capable of killing various pathogenic bacteria and viruses, enhancing the body's antibacterial ability, increasing the skin's resistance to external stimuli, and stimulating the bone marrow's hematopoietic function. Ultraviolet exposure can also convert 7-dehydrocholesterol under the skin into vitamin D, thereby promoting the absorption and storage of calcium and phosphorus, which is beneficial for preventing and treating rickets, osteomalacia, and renal hypocalcemia in children. Therefore, it is essential to take children out to bask in the sun. Sunbathing is a science, and it is important to choose the right time and method.
