A child who is deficient in vitamin D and not calcium is usually not required to take calcium tablets. Vitamin D can promote the absorption of calcium to avoid rickets and other conditions, if the child is not deficient in calcium, but a lack of vitamin D, may lead to the child’s body calcium can not be well absorbed, the child may have agitation, irritation, sweating, night terrors, bone deformities and other symptoms appear. Calcium tablets are usually taken when the child is deficient in calcium, if the child is not deficient in calcium but only in vitamin D it is not recommended to take calcium tablets. Some children may experience adverse effects such as belching and constipation after excessive calcium supplementation. If the child is diagnosed with nutritional vitamin D deficiency, it is recommended that standardized treatment be carried out as soon as possible so as not to miss the opportunity for treatment. All medications should be used under the guidance of a doctor, avoid self-medication.