Fetal heart size measured in vivo by ultrasound.
D005260:Female; D005318:Fetal Heart / Q000033:anatomy & histology* / Q000254:growth & development; D006346:Heart Septum / Q000033:anatomy & histology; D006352:Heart Ventricles / Q000033:anatomy & histology; D006801:Humans; D008722:Methods; D011247:Pregnancy; D013909:Thorax / Q000033:anatomy & histology; D014463:Ultrasonography