Estimation of fetal age by means of ultrasound.
D005260:Female; D005318:Fetal Heart / Q000502:physiology; D005333:Fetus / Q000502:physiology; D005865:Gestational Age; D006128:Growth; D006339:Heart Rate; D006801:Humans; D010387:Pelvimetry / Q000379:methods; D011247:Pregnancy; D014463:Ultrasonography