![]() The underlying causes of an irregular fetal heartbeat include: More often than not, the problem resolves on its own. A slower than usual heartbeat (bradycardia)įetal arrhythmia happens in only 1 to 2 percent of pregnancies, and is considered a benign condition.A higher than usual heartbeat (tachycardia).If your doctor notices an irregular heartbeat (or fetal arrhythmia) at a routine prenatal visit, it can mean one of the following: In these instances, a transvaginal ultrasound is a good alternative.Īverage fetal heartbeat is between 120 and 160 beats per minute, but tends to be higher during the first trimester. Mother’s weight: If your body mass index (BMI) is more than 25, a layer of abdominal fat is likely preventing the fetal Doppler or fetoscope from catching the heartbeat.Fetus is out of range: Early on, your baby might be far too tiny for their heartbeat to be definitively recorded by such devices.A tilted uterus, for example, could make it tougher for the fetal Doppler to do its job. Uterus shape: The shape and orientation of your uterus directly impact the ease of detection.Too early in the pregnancy: Gestational age is occasionally inaccurate due to irregular periods, and you might not be as far along in the pregnancy as you think.In most cases, there’s no need to worry as there are multiple explanations. ![]() But there are times when your doctor is unable to spot it on the ultrasound right away. The fetal Doppler does in fact have the capability to catch your little one’s heartbeat in the first trimester.
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