normal heart rate for 13 week fetus

normal heart rate for 13 week fetus

normal heart rate for 13 week fetus

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Weeks 10-15 :Baby’s Growth & Development

Near the end of the first trimester (13 weeks gestation) your baby is about three inches long. It weighs about one ounce. The brain and spinal cord are developing rapidly. Your baby can squint, frown, open and shut its mouth, turn its head, make a fist, and kick.

The placenta has formed and blood is now circulating through the umbilical cord. Amniotic fluid cushions the baby and allows the baby to move around easily. At this time, you cannot feel these movements.

The baby’s heartbeat may be heard as early as the twelfth week of pregnancy using a highly sensitive Doppler that allows us to hear the baby’s heartbeat. The normal range for the baby’s heart rate is 115 to 160 beats per minute. Fast or slow, the heart rate is not a valid indication of whether a baby is a girl or boy.

normal heart rate for 13 week fetus
normal heart rate for 13 week fetus

What’s a Normal Fetal Heart Rate During Pregnancy?

Fetal heart rate is a term that refers to a baby’s heartbeat while they’re in the uterus. It can provide lots of information about your baby’s health during pregnancy. Healthcare providers usually start listening for a baby’s heart rate at the 10- or 12-week prenatal visit.

From there, providers generally check it during each subsequent prenatal appointment and also monitor it during labor.

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This article reviews normal fetal heart rate, how it is measured, who should monitor it, and what causes variations.


Normal Fetal Heart Rate

Healthcare providers measure fetal heart rate by the number of fetal (baby) heartbeats per minute (BPM) during pregnancy. This measurement helps healthcare providers determine the well-being of the fetus during prenatal visits or labor.

Monitoring fetal heart rate during pregnancy has been a focus for doctors and midwives since the 1800s. In 1822, a French obstetrician gave the first written detailed description of fetal heart sounds. Nearly 100 years later, they found that very low heart rate (bradycardia) indicated fetal distress.

normal heart rate for 13 week fetus
normal heart rate for 13 week fetus

The average fetal heart rate varies depending on the stage of pregnancy. Here’s generally what to expect:

  • Beginning of pregnancy: A baby’s heart starts to develop around the fifth week of pregnancy. In this early stage, the heart rate starts slow and averages 110 BPM around the sixth week.
  • Ninth week of pregnancy: Around the ninth week of pregnancy, the heart rate speeds up to an average of 140 to 170 BPM. By week 12, the rate slows down a bit. Throughout the rest of the pregnancy, the average is 110 to 160 BPM. However, it can vary from 5 to 25 beats per minute.
  • Last 10 weeks of pregnancy: During the last trimester, the fetal heart rate continues to average 110 to 160 BPM. However, it drops slightly in the last 10 weeks. In general, it moves towards the lower end of this range the closer you get to your due date.
  • Variations: Fetal heart rate varies throughout the day and night due to the baby’s activity level. It increases while they are moving around and decreases while they’re asleep. These changes are similar to what adults experience while exercising or at rest.
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