fˈiːɾəl ˌɛkəkˌɑːɹdɪˈoʊɡɹəfi hɐz ʃˈoʊn ðæt ˌiːˌɛfˈiː kæn bɪɡˈɪn tʊ ɐkjˈuːmjʊlˌeɪt æz ˈɜːli æz fˈoːɹtiːn wˈiːks ʌv dʒɛstˈeɪʃən, ænd ˈɪŋkɹiːs wɪð ɪŋkɹˈɛdɪbəl ɹæpˈɪdᵻɾi ænd ˈiːvən ðˌɐɾɪt kæn biː ɹᵻvˈɜːst ɪf ðə stɹˈɛs kæn biː ɹᵻmˈuːvd ˈɜːli ɪn fˈiːɾəl lˈaɪf.
Fetal echocardiography has shown that EFE can begin to accumulate as early as 14 weeks of gestation, and increase with incredible rapidity and even that it can be reversed if the stress can be removed early in fetal life.