The liquor (amniotic fluid) is monitored throughout the labor. Thick meconium staining liquor indicates that the baby has passed motion inside the mother's womb. This could be associated with fetal distress and the doctor may expedite delivery. There is also a worry that the baby may aspirate (breathe in) the meconium stained liquor, resulting in lung infection and injury.
If the liquor is heavily blood stained, premature separation of the placenta (placenta abruption) needs to be excluded. With premature separation of the placenta, there is an abrupt "cut off" of oxygen supply to the baby and immediate delivery is required.
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