Therefore, it is speculated that, for eczema infants with intestinal flora disorder (who always adhere to Vit D 400 IU/d feeding), changing their Vit D to low-dose (200 IU/d) feeding may reduce the gastrointestinal burden of infants, and improve the composition of intestinal flora by improving the Vit D/VDR signal pathway. This evidence concerns the gene VDR and Eczematoid dermatitis.