Studies on fetal movement and fetal heart rate changes at 20 to 32 weeks' gestation.
D005314:Embryonic and Fetal Development; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D005324:Fetal Movement; D005865:Gestational Age; D006339:Heart Rate; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D011446:Prospective Studies; D014463:Ultrasonography