When the presentation of the foetus changes from day to day the lie is said to be unstable.
It is not a sinister sign in the grand multip - the uterus is relatively flaccid and able to accommodate a lot of movement of the fetus.
In other women it ought to be investigated as a possible sign of placenta praevia - the low lying placenta preventing engagement of the fetal head.
Other possible causes of an unstable lie include:
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