Conflicts of Interest The authors declare no conflicts of interest. References 1, , , et al., University of California Fetal–Maternal Consortium (UCfC), “Nonimmune Hydrops Fetalis: Identifying the Underlying Genetic Etiology,” Genetics in Medicine 21, no. 6 (June 2019): 1339–1344: Epub 2018 Nov 9. PMID: 30410095; PMCID: PMC6509016, https://doi.org/10.1038/s41436-018-0352-6. 2, , , , and , “Etiology and Outcome of Hydrops Fetalis,” Journal of Maternal-Fetal Medicine 10, no.