This document summarizes information about cardiomyopathy in newborns and fetuses. It discusses definitions, classifications, etiologies, clinical features, diagnostic evaluations, and management strategies for various types of neonatal cardiomyopathy. It also reviews a journal article studying fetal cardiomyopathy detected on prenatal echocardiograms, finding reduced systolic function, valve issues, and chamber enlargement in some cases. Outcomes were generally poor, though early diagnosis may allow for interventions to improve prognosis.