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30 March 2025

At how many weeks of pregnancy can the fetal heartbeat be heard?


30 March 2025
Updates

How to listen to the fetal heartbeat

Real-time sonography is a type of ultrasound examination where images are created by emitting high-frequency sound waves to examine organs inside the body that cannot be seen by the naked eye, such as the heartbeat and movement of the fetus. This can be done once the pregnancy is at least 2 months along.

Ultrasonic Doppler is a high-frequency sound machine that doctors use to assess the health of the fetus. Using this machine, the fetal heartbeat can be heard from around 10-12 weeks of pregnancy.

A stethoscope is a simple listening tool that doctors can use to hear the fetal heartbeat from around 18-20 weeks of pregnancy. The doctor places the stethoscope on the abdomen, and the heartbeat can be heard as a steady, rhythmic sound.

Echocardiography is another tool that uses high-frequency sound waves to examine the heart's function and allows the mother to hear the fetal heartbeat as well. This method can be used as early as 48 days after the last menstrual period.

Fetal heartbeat listening positions

If the fetal presenting part is the buttocks, the heartbeat will be heard higher than the level of the belly button.

If the fetal presenting part is the head, the heartbeat will be heard lower than the level of the belly button.

If the occiput is positioned to the right front of the mother's pelvis, the most distinct place to hear the fetal heartbeat is at the lower right side of the mother's abdomen.

If the occiput is positioned to the left front of the mother's pelvis, the most distinct place to hear the fetal heartbeat is at the lower left side of the mother's abdomen.

Do the heartbeat rhythms of the mother and baby beat in sync?

For mothers and their babies, everything may seem connected, but in reality, the baby is another life inside the mother’s womb. Therefore, the mother’s and baby’s heartbeats do not always beat in sync. Around 8-9 weeks, the baby's heartbeat will be faster than the mother's, with the baby’s heart rate reaching about 175 beats per minute. This period also coincides with the time when most mothers have their first ultrasound.

If any women are concerned, they can consult with Beyond IVF or add Line @beyondivf for more information.

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The Biological Clock

This tool indicates:

  • Natural conception per month if you have no fertility issues
  • IVF success rate at the same age
  • When to seek help after months of unsuccessful attempts

If you are concerned at any stage – we recommend booking a doctor appointment or a free nurse consultation. The sooner you make a plan the better your chances in the long term.

When to seek advice early

  • If you have polycystic ovaries, endometriosis, or have been through a cancer diagnosis; we recommend you get in touch quickly so we can talk you through all your options and give you the greatest possible chance of success.
  • If you’re a single woman considering motherhood in the future; it’s best to approach us early and consider egg freezing as this can be an option for you while you have a higher ovarian reserve and healthier eggs.
Set your age and the months you’ve been trying to conceive
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Your chance of having a baby per month for fertile couples
Your chance of having a baby per IVF cycle (if experiencing infertility)

Body Mass Index calculator

Being overweight or underweight can reduce fertility, so it is important to keep your body weight within the normal healthy range.

Body Mass Index (BMI) is an indication of your body weight and can be calculated by dividing weight by height. You should aim for a BMI of between 20 and 25, as this will optimise your chances of conception.

Woman’s BMI below 19

Even in these modern times, nature knows best. If a woman's BMI falls below 19, the body senses famine and ovulation is switched off to prevent the risk of having a baby with malnutrition. Excessive exercise can reduce body fat and increase muscle mass to a point where periods cease for the same reason. Risk of miscarriage is also increased in women with a low BMI.

Being underweight

If a woman's BMI falls below 19, the body senses famine and ovulation is switched off to prevent the risk of having a baby with malnutrition. Excessive exercise can reduce body fat and increase muscle mass to a point where periods cease for the same reason. Risk of miscarriage is also increased in women with a low BMI.

BMI’s greater than 30

This can reduce fertility by 50%. Pregnancy for women with a 30+ BMI is often associated with problems such as maternal diabetes, high blood pressure, big babies and increased risk of caesarean section.

Add your height and weight to calculate your BMI