Take d3 and ad interchangeably. If there are symptoms of vitamin a deficiency, you should take vitamin ad orally, there is no deficiency of vitamin a manifestation, d3 and ad can be replaced. d3 and ad can not be eaten together, because most of the components of ad is vitamin d3, the main component of vitamin d3 is also d3, these two have the same composition, so ad and d3 should not be eaten together, if eaten together will cause vitamin d3 poisoning. If the child has symptoms of vitamin a deficiency, such as night blindness, dry skin, flaking, may lack of vitamin a, it is recommended to take oral vitamin ad every day. in addition to supplementing vitamin d at the same time, but also to supplement the vitamin a, prevent related diseases. If the child’s diet is normal, there is no sign of vitamin a deficiency. You can switch between vitamin ad and vitamin d3 to supplement vitamin d and prevent rickets. In addition, supplementing vitamin d3 in addition to eating ad and d3, the diet contains more food containing d3, such as animal liver, lean meat, egg yolk. It is recommended that you should usually spend more time outdoors, and sunbathing outdoors also helps the absorption of vitamin d3 and helps the development of the body.