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The mother's blood supply enters the foetus via the umbillical cord and allows oxygen to diffuse from the mother's blood into the foetus.
Through the umbilical cord from the placenta since a fetus can't use lungs to obtain oxygen. Read more in the link below about fetal circulation.
The foetus in embedded in fluid called amniotic fluid. Some times the foetus takes a breath in that fluid, just before the delivery. The result is disastrous. If the foetus is born with the fluid in the lungs, it is going to die in most of the cases. The foetus is getting all the oxygen and the nutrition from the mother. This is supplied through the placenta. So the lungs of the foetus are at rest in the womb of the mother.
A growing foetus needs the cord because it gives the food and oxygen from the mother into the babyThe cord feeds the baby and gives the baby oxygen.All foetus's need a cord !
Everything is supplied and filtered by the placenta.
Our body obtain oxygen to our body by breathing.
The fetus gets food and oxygen through the umbilical cord.
Oxygen from the mother's blood diffuses across the placenta into the foetal blood. This oxygen is then carried by red blood cells to the cells of the foetus through the circulatory system. The exchange of oxygen and carbon dioxide occurs at the capillaries, allowing oxygen to reach the foetal cells for cellular respiration.
Crustaceans obtain oxygen through gills.
Who is "they" ?
Amniocentesis?
you obtain oxygen from your lungs you could breath through your nose and through your mouth