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It is not just when having contractions, it is in late pregnancy, and it doesn't happen to everyone but eough women to make it a rule. The major vein returning to the heart from the lower part of the body (vena cava inferior) runs up the right side of the spine and if the woman lays on her back the heavy uterus compresses the vein preventing blood returning to the heart causing a fall in blood pressure and fainting and the baby's heartbeat also falls giving the appearance that the baby is distressed. I once delivered a woman having her second baby who had this problem quite severely. I delivered her laying totally on her left side. Reading the notes from her first baby it was clear that the same thing had happened then but a nervous carer had not recognised the signs and rather than doing the simple thing had performed a forceps delivery.

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Q: Why should a lady lie on her left side when having contractions?
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