The serum immune function related indexes, namely the CD4+/CD8+ ratio, Ig E level, and serum inflammatory factor IL-6, in the ECZ group were higher than those in the CON group (p < 0.05) (Table 2).After being given different doses of Vit D for one month, it was found that, for eczema infants with intestinal flora disorder (those who always adhere to Vit D 400 IU/d feeding), increasing the feeding dose of Vit D in the HIGH-D group (800 IU/d) still could not significantly reverse the disorder of immune function (Table 2) and intestinal flora (Figure 2, Figure 4, Figure 5 and Figure 6). This evidence concerns the gene CD4 and Eczematoid dermatitis.