Meconium alone cannot be relied on as an indication of fetal distress: “… meconium passage, in the absence of other signs of fetal distress, is not a sign of hypoxia…”(Unsworth & Vause 2010). An abnormal heart rate is a better predictor of fetal distress; and an abnormal heart rate + meconium provides an even better indication that a baby may be in trouble. In addition, thick meconium rather than thin meconium is associated with complications. Despite this, babies who are known to have passed meconium (of any variety) without any other risk factors are treated as if they are in imminent danger. I am guessing this is because if a previously unstressed baby becomes hypoxic during labour it may result in the dreaded MAS.
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