RecruitingPhase 2Biological interventionIntraamniotic Administrations of ER004 to Male Subjects With X-linked Hypohidrotic Ectodermal DysplasiaThis is an open-label, prospective, genotype-match controlled for primary estimand, non randomized, multicenter, international Phase 2 clinical trial designed to investigate the efficacy and safety of ER004 administered intraamniotically as a treatment for unborn XLHED male subjects.