Fetal breathing.
D000818:Animals; D004301:Doppler Effect; D005260:Female; D005312:Fetal Blood / Q000502:physiology; D005333:Fetus / Q000502:physiology*; D006801:Humans; D009132:Muscles / Q000196:embryology; D011247:Pregnancy; D012119:Respiration; D012129:Respiratory Function Tests / Q000379:methods; D012137:Respiratory System / Q000196:embryology; D012756:Sheep; D014463:Ultrasonography