SOD1 and hydrops fetalis: As shown in Figure 3B, the SOD activity of plasma in this experiment was 3.07 ± 0.17 U/mL in the HF group, only 43.64% compared to 7.04 ± 0.08 U/mL in the control group, and all DLW-treated groups were significantly higher in the HF+DLW250 group, HF+DLW500 group, 1.8 and 2.1 times that of the HF group, respectively (p < 0.05).