EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The human foetus after the 5th month of development, showing a close-up of the mouth & nostrils. Maturation of the nervous & muscular systems allows the foetus to suck in amniotic fluid, which the kidneys slowly process & return to the fluid. No waste producsts are discharged via the rectum, so the mother is active at this time in removing foetal waste materials.
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