Get proper sun exposure Sun exposure is the most effective, convenient and economical way to supplement vitamin D. Parents should always let their babies spend time outdoors. In spring or fall, you can let your baby play directly in the sun, and in summer, you can let your baby cool off in the shade so that your baby’s skin is exposed to UV rays regularly. UV exposure promotes the conversion of 7-dehydrocholesterol stored in the skin into vitamin D3 by chemotaxis and is stored in the skin for backup. Oral vitamin D. Except for the liver of marine fish, which contains some vitamin D, there is very little in dairy (both human and cow’s milk), egg yolk and meat, and almost none in cereals, vegetables and fruits. The daily intake of vitamin D from natural foods for infants and young children does not meet their developmental needs. Normal children, regardless of age, need 400 international units of vitamin D supplementation per person per day, while premature infants, congenitally under-stored or overgrown infants should have their needs increased. Vitamin D is generally taken from half a month after birth and can be taken until the age of 3. Note on vitamin D supplementation for babies: 1. If your baby is taking vitamin D fortified formula, calculate the amount of vitamin D according to the amount of milk and supplement the shortfall. 2.Baby may be poisoned by taking more than 40 times the preventive amount of vitamin D. 400 international units is the daily preventive amount. 3.If your baby is found to have rickets, it must be treated accordingly under the guidance of a doctor. Warm reminder There are many parents who stop taking vitamin D because their babies are sick, is this appropriate? I think it is more important to take vitamin D when your baby is sick, with a preventive amount of 400 international units per day. In addition to promoting the absorption and utilization of calcium and phosphorus and preventing rickets, vitamin D can also enhance muscle strength, improve resistance, prevent the occurrence of respiratory diseases in babies, reduce the occurrence of autoimmune diseases and cardiovascular diseases, prevent diabetes, and inhibit the proliferation of cancer cells.