BCL2 and hydrops fetalis: Additionally, the HF group had a higher BAX/Bcl‐2 ratio (Figure 4d) and active/inactive caspase‐3 expression ratio (Figure 4e) than the SC group (+166.41%, p = 0.0104; +48.76%, p < 0.0001, respectively), indicating the activation of the pro‐apoptotic pathway.