The fetus and the newborn.
D000653:Amniotic Fluid / Q000502:physiology; D000818:Animals; D002415:Cats; D004285:Dogs; D005260:Female; D005313:Fetal Death / Q000517:prevention & control; D005315:Fetal Diseases / Q000517:prevention & control; D005333:Fetus / Q000000981:diagnostic imaging / Q000502:physiology*; D006168:Guinea Pigs; D000882:Haplorhini; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000517:prevention & control; D008431:Maternal-Fetal Exchange; D051379:Mice; D008954:Models, Biological; D010920:Placenta / Q000502:physiology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology; D011817:Rabbits; D011859:Radiography; D051381:Rats; D014463:Ultrasonography