The symptoms of irritability, irritability, restless sleep, night terrors, night crying and excessive sweating in babies are not caused by calcium deficiency, but may be caused by vitamin D. Let’s learn together today about vitamin D, which is indispensable for the growth and development of babies. The role of vitamin D Vitamin D is a fat-soluble vitamin that promotes the absorption and utilization of calcium, which enables calcium to be deposited from the blood into the fast-growing bones, making the bones harden. If you lack vitamin D, the calcium in your body will not be easily absorbed and utilized, which means that the lack of vitamin D is the “cause” and the lack of calcium is the “effect”, and as long as vitamin D is in place, calcium can be better absorbed. Vitamin D is also an important regulator of immune function. It regulates the differentiation, maturation and function of immune cells such as monocytes, macrophages, dendritic cells, T cells and B cells in babies, and babies who are deficient in vitamin D are more likely to develop infectious diseases of the whistle system, asthma, type 1 diabetes, food allergies, etc. Vitamin D supplementation The Chinese Academy of Pediatrics recommends that infants should receive 400 units of vitamin D per day from 2 weeks to 2 years of age after birth. The American Academy of Pediatrics recommends that all infants and toddlers should receive at least 400 units of vitamin D daily from shortly after birth and 600 units of vitamin D daily for children over 1 year of age. According to China’s “Infant Formula”, the range of vitamin D content in formula is 40-100 IU/100kcal, while the calorie content of formula is basically 60-70 kcal/100ml. In this way, the daily amount of formula milk for infants should be almost 1000 ml to meet the daily requirement of about 400 units of vitamin D. Our recommendation Full-term infants need 400 units of vitamin D supplementation per day, whether they are breastfed or formula-fed babies or babies with complementary foods, while premature babies, those with congenital storage deficiency or overgrown infants need an increased amount and need to consult The pediatrician should be consulted to increase the amount. Where does vitamin D for babies come from? 1.Appropriate sun exposure. Allow your baby to be outdoors often. In spring and autumn, you can let your baby directly under the sun, and in summer under the shade of a tree, so that the baby’s skin is often exposed to ultraviolet light. Ultraviolet radiation can promote the 7-dehydrocholesterol stored in the skin, through photochemical conversion to vitamin D3. sunlight exposure, can make the skin storage vitamin D3 backup, will not make vitamin D excess. Because the synthesis of vitamin D is affected by the level of sunlight, latitude and longitude, season, climate, air pollution, etc. It is difficult to achieve the needs of the baby’s growth and development, so usually additional vitamin D supplementation. 2, food and vitamin D preparations. Except for the liver of sea fish, which contains a certain amount of vitamin D, dairy (including human milk and cow’s milk), egg yolk and meat contain very little, and cereals, vegetables and fruits contain almost none, so the daily intake of vitamin D from natural foods for infants and young children cannot meet their developmental needs. The most common form of vitamin D supplementation is VD preparations. Warm tips If lack of vitamin D, calcium can not be well absorbed and utilized, which can cause abnormal calcium and phosphorus metabolism in the body, not only make the bones poorly calcified and cause bone lesions, manifested as cranial softening, ping-pong feeling, forming chicken chest, “O” shaped legs or “X “The early performance of night sweating, occipital baldness to form occipital baldness, sleep restlessness and easy to startle and other phenomena, is also commonly known as vitamin D deficiency rickets.