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Fetal Heart Rate Monitoring in Labor.

When your uterus (womb) has a contraction (muscles get tight), your blood flow to the placenta (afterbirth) slows down. Your baby gets oxygen from your blood through the placenta. Most babies have enough oxygen stored up so this slower blood flow during contractions does not cause any problems. If your baby is not getting enough oxygen, their heart rate can slow down or speed up for a short time. Your health care provider will be watching for how your baby’s heart rate changes as you have labor contractions.