Dynamic Critical Congenital Heart Screening With Addition of Perfusion Measurements

Inclusion Criteria: * Age \< 22 days * Fetuses suspected to have congenital heart disease * Newborns with suspected/confirmed critical congenital heart disease * Asymptomatic newborn undergoing SpO2 screening for CCHD Exclusion Criteria: * Echocardiogram completed prior to enrollment as the newborn would then no longer be considered "asymptomatic undergoing SpO2 screening for CCHD" * For Newborns with confirmed/suspected congenital heart disease (CHD): a) Patent ductus arteriosus and/or atrial septal defect/patent foramen ovale without other defects, b) Corrective cardiac surgical or catheter intervention performed before enrollment or c) Current infusions of vasoactive medications other than prostaglandin therapy.