The daily physiological requirement of vitamin D for babies over 2 years old is usually 400 units, usually 1 capsule. If vitamin D deficiency manifests itself, vitamin D intake needs to be adjusted under the guidance of a doctor. In daily life, you can get vitamin D through outdoor exercise in the sun, food, animal liver, etc. Vitamin D is mainly to promote the child’s body calcium, phosphorus absorption, promote skin cell growth, differentiation and regulation of immunity, so as to avoid rickets, osteomalacia and other diseases. The daily physiological requirement of vitamin D for babies over 2 years old is usually 400 units, usually 1 capsule, and vitamin D supplementation is required under the guidance of a doctor. If the child appears rickets, O-shaped legs, X-shaped legs and other manifestations, need to be vigilant about vitamin D deficiency, it is recommended to consult a doctor in a timely manner, improve the bone density, vitamin D levels and other tests, follow the doctor’s instructions in a timely manner to supplement vitamin D and calcium supplements, do not take unauthorized medication, so as to avoid delays in the condition.