When this happens the baby’s heart rate will dip during a contraction in response to the reduced blood flow. In addition, the umbilical cord may be in a position where it gets squashed between baby and uterus with contractions. When the placenta is compressed blood circulation is interrupted reducing the oxygen supply to baby. When fluid is reduced (by escaping through a hole in the membranes), the placenta and baby get compressed more firmly during a contraction. This protects the baby and their oxygen supply from the effects of the powerful uterine contractions. General fluid pressureĭuring a contraction the pressure is equalised throughout the fluid rather than directly squeezing the baby, placenta and umbilical cord. During labour and birthĪround 80-90% of women start labour with their membranes intact. This is probably because the amniotic sac plays an important role in the physiology of childbirth. This meconium is diluted and processed with the amniotic fluid as described above. This is perfectly normal and is not a sign of distress.
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