normal heart rate for 12 week fetus

normal heart rate for 12 week fetus

normal heart rate for 12 week fetus

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What’s on your mind when you’re 12 weeks pregnant

Telling everyone
Soon, your rate of miscarriage will drop significantly: Only an estimated two to three percent of pregnancies that make it to the second trimester end in miscarriage. (After 20 weeks gestation, that drops to less than 0.5 percent.) That’s why a lot of women choose to make their pregnancies public around week 13. At work, make sure to tell your boss about your pregnancy in a private conversation before letting other members of your team know. Then the fun part: telling friends and extended family. Check out our 12 favourite baby announcement videos for some inspiration on how to do it.

Hearing the heartbeat
One of the most emotional moments in pregnancy is hearing your baby’s heartbeat for the first time. If it hasn’t happened by week 12, you should get a chance very soon. This is often the time when your doctor or midwife will find your baby’s heartbeat with a handheld ultrasound called a Doppler machine. Your baby’s little heart is racing away at about 110 to 160 beats per minute—that’s probably twice as fast as yours (and totally normal, BTW). If you can’t hear it, don’t panic: The baby might be in the wrong position or your due date might be off by a week or two.

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normal heart rate for 12 week fetus
normal heart rate for 12 week fetus

Just for kicks

If you’re telling everyone about your pregnancy this week, prepare yourself: You’re about to get an onslaught of unsolicited advice. Get used to it, mama! This continues throughout pregnancy, birth and parenthood. Have you made up your mind about whether or not you’re finding out the sex of your baby? After you make the announcement, everyone is going to ask you where you stand and debate the merits of both approaches.

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Fetal heart rate in the first and second trimester

A normal fetal heart rate (FHR) usually ranges from 120 to 160 beats per minute (bpm) in the in utero period. It is measurable sonographically from around 6 weeks and the normal range varies during gestation, increasing to around 170 bpm at 10 weeks and decreasing from then to around 130 bpm at term.

Evolution through gestation

Although the myocardium begins to contract rhythmically by 3 weeks after conception (from spontaneously depolarizing myocardial pacemaker cells in the embryonic heart) it is first visible on sonography around 6 weeks of gestation. The FHR is then usually around 100 to 120 beats per minute (bpm).

FHR then increases progressively over the subsequent 2-3 weeks becoming 7:

  • ~110 bpm (mean) by 5-6 weeks
  • ~170 bpm by 9-10 weeks
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This is followed by a decrease in FHR becoming on average:

  • ~150 bpm by 14 weeks
  • ~140 bpm by 20 weeks
  • ~130 bpm by term

Although in the healthy fetus the heart rate is usually regular, a beat-to-beat variation of approximately 5 to 15 beats per minute can be allowed.

normal heart rate for 12 week fetus
normal heart rate for 12 week fetus

Related pathology

A slow fetal heart rate is termed fetal bradycardia and is usually defined as :

  • FHR <100 bpm before 6.3 weeks gestation, or
  • FHR <120 bpm between 6.3 and 7.0 weeks

A rapid fetal heart rate is termed a fetal tachycardia and is usually defined as:

  • FHR >160-180 bpm 5,7
  • FHR around 170 bpm may be classified as borderline fetal tachycardia

A rapid and irregular fetal heart rate is usually termed a fetal tachyarrhythmia.

 

 

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