There is nothing special about the choice of children’s vitamin D. Medicines produced by regular manufacturers with instructions showing that they are available to children can generally be taken. However, it should be noted that the need to follow the doctor’s advice to take. There are no special requirements for children’s vitamin D, but it is recommended to choose regular manufacturers of pharmaceutical vitamin D preparations, as far as possible not to use health care products of vitamin D. Because the health care products can not replace the drug, does not have the role of treatment of disease. Children commonly used vitamin D preparations are vitamin D drops, used for the prevention and treatment of vitamin D deficiency, such as rickets. Children usually start regular vitamin D supplementation from 7-14 days of birth, 400 IU per day can meet the daily needs, usually supplementation until 2-3 years old. It is important to note that supplementation can be continued beyond the age of 3 years if vitamin D deficiency exists. Vitamin D preparations are medicines and should be taken or discontinued under the guidance of a doctor, and should not be taken blindly or have the dosage changed, etc., in order to avoid adverse effects on children’s health.