RecruitingDevice studySafety and Efficacy of Fetoscopic Endoluminal Tracheal Occlusion (FETO) in Congenital Diaphragmatic Hernia (CDH)The purpose of the study is to determine if babies with left or right-sided CDH that undergo the FETO procedure survive more often and have fewer long-term complications than babies that have similar left or right-sided CDH that elect not to have the FETO procedure performed during pregnancy.