Life before birth.
D000818:Animals; D001783:Blood Flow Velocity; D005314:Embryonic and Fetal Development; D005260:Female; D005333:Fetus / Q000502:physiology*; D006321:Heart / Q000196:embryology; D006801:Humans; D008954:Models, Biological; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012119:Respiration; D014463:Ultrasonography