SFRP4 and hydrops fetalis: These target genes were obtained by the intersection of the above screened 1145 targets with the DEGs between DPCs and HMCs, and numerous genes, including SFRP4, FGF22, BMP4, PDGFRA, GATA3, and TGFB3, related to HF development were shown to be the target genes of the screened miRNAs (Figure 6d), suggesting that the regulation of these miRNAs in HF development may involve these target genes.