It is recommended to take vitamin ad and d3 alternately, which is better, that is, one day to take vitamin ad, the second day to take d3, two days for a cycle of medication. If you take vitamin ad and d3 at the same time, it is easy to cause vitamin d overdose. It is recommended to let the baby more sunshine, is also conducive to calcium supplementation. For children with more serious calcium deficiency, it is recommended to take calcium carbonate d3 granules to supplement the calcium treatment, combined treatment will be more effective.