If the oxygen supply to your baby continues to be reduced, she/he may need to be delivered early or even immediately. If this happens before you're 37 weeks pregnant, your baby will be premature. Premature babies are at risk of complications because many of their organs (especially the heart and lungs) may not be ready to work outside the womb. The earlier a baby is delivered, the greater the risk of serious medical complications. However, this needs to be balanced against the risks of your baby not receiving enough oxygen if she/he is not delivered early.
Attribution: BUPA