When Can You Hear Your Baby's Heartbeat? A Week-by-Week Guide

• A heartbeat (cardiac flicker) is usually visible on transvaginal ultrasound from about 6 weeks, and on the more familiar belly (transabdominal) scan from 7 to 8 weeks.
• A handheld Doppler at antenatal visits can pick up the heartbeat from about 10 to 12 weeks, reliably by 14 to 16 weeks.
• Normal fetal heart rate rises to a peak of about 160 to 170 bpm around 9 to 10 weeks, then settles to 110 to 160 bpm for most of pregnancy.
• Once a heartbeat is confirmed at 6 to 7 weeks, the chance of miscarriage drops substantially, which is reassuring after a previous loss.
• Heart rate does NOT predict your baby's sex, and sex determination is illegal in India under the PCPNDT Act.
• Home Dopplers are not recommended as a way to check on your baby; reduced movement or any worry needs professional assessment, not a home device.

The fetal heart is the first organ to function, and it forms astonishingly early. The earliest cardiac structures, the primitive heart tubes, appear by roughly 18 to 21 days after conception (about 4.5 weeks counting from your last menstrual period). These tubes fuse and begin to contract.

Regular, rhythmic cardiac activity starts at about 5 to 6 weeks of gestation. At this stage the heart is still a simple tube beating before it has any chambers, and the rate is slow, often 80 to 100 beats per minute (bpm).

Between 6 and 8 weeks the tube folds (a process called looping) and the walls (septa) that will divide the chambers begin to form. By around 8 weeks the four-chamber shape is becoming recognisable, and by about 10 weeks the four-chambered heart is essentially complete. Valves, the electrical conduction system and the great vessels keep refining through the second trimester.

The heart rate follows a characteristic curve: slow at first, rising to a peak of about 160 to 170 bpm around 9 to 10 weeks (the fastest it will ever be), then gradually settling to the normal 110 to 160 bpm range from about 14 weeks onward. This rise-then-fall pattern is a normal sign of healthy development, not a problem.

Before birth, the baby's circulation works differently from ours. Oxygen comes from the placenta rather than the lungs, and blood is cleverly shunted through three openings (the foramen ovale, ductus arteriosus and ductus venosus) to bypass the lungs and liver. These shunts close in the first hours and days after birth as the newborn switches to breathing air.

Because the heart forms so early, most congenital heart defects begin in the first trimester. Congenital heart disease (CHD) affects roughly 8 to 10 per 1,000 live births in India. Many forms are mild and need no treatment; some are serious and need surgery in infancy. You can read more in our overview of congenital diseases and birth defects.

Some risk factors are modifiable. Taking folic acid before and during early pregnancy, keeping diabetes and thyroid well controlled, avoiding alcohol, smoking and known teratogenic medicines, and ensuring rubella immunity through pre-conception vaccination all lower the risk. Not every defect is preventable, but optimising these factors helps.

A transvaginal ultrasound (TVS) gives the earliest reliable view of cardiac activity, often from about 5.5 to 6 weeks. Because a small probe is placed inside the vagina, it sits much closer to the early pregnancy than a belly scan, giving a clearer picture of the gestational sac, yolk sac and embryo.

On TVS, structures appear in a predictable order: the gestational sac by about 4.5 to 5 weeks, the yolk sac by 5.5 to 6 weeks, the embryonic pole by 5.5 to 6.5 weeks, and the cardiac flicker (a tiny rhythmic pulsing) by about 5.5 to 6.5 weeks. Limb buds follow at 7 to 8 weeks.

In early pregnancy, doctors usually measure the rate using M-mode rather than colour or pulsed Doppler, because Doppler delivers more energy to delicate developing tissue and is kept to a minimum in the first trimester. Typical early rates are 100 to 120 bpm at 6 to 7 weeks, rising to around 160 to 170 bpm by 8 to 10 weeks.

If a heartbeat is not seen exactly when expected, it does not automatically mean something is wrong. The commonest reason is simply that the pregnancy is a little earlier than your dates suggested. Other possibilities include a blighted ovum (anembryonic pregnancy), an early embryonic demise, or, if the pregnancy is not seen inside the uterus at all, an ectopic pregnancy.

Guidelines use clear thresholds before diagnosing a loss, to avoid acting too soon. If the gestational sac measures 25 mm or more with no visible embryo, or the embryo measures 7 mm or more with no cardiac activity, a non-viable pregnancy is diagnosed. Otherwise, a repeat scan in 7 to 14 days usually clarifies the picture, sometimes alongside serial beta-hCG blood tests.

TVS is safe in early pregnancy. It does not cause miscarriage and does not harm the developing baby. The probe is covered with a fresh disposable sheath; you may feel brief pressure, but it is generally well tolerated. In India a scan typically costs Rs 800 to Rs 2,500, and medically necessary scans are usually covered by insurance.

Seeing that first flicker is deeply moving for many people, especially after a previous loss. If you are carrying anxiety from a past miscarriage, you are not alone; our guide to pregnancy after loss anxiety offers practical ways to cope between scans.

The transabdominal scan (TAS), the familiar ultrasound done over your belly with gel and a probe, usually picks up cardiac activity from about 7 to 8 weeks. It is the standard scan for most antenatal care once you are past the early first trimester.

Because the probe is further from the pregnancy than in TVS, early structures show up a little later: the gestational sac by 5 to 6 weeks, the yolk sac by 6 to 7 weeks, the embryonic pole by 6.5 to 7 weeks, and the heartbeat by 7 to 8 weeks in most pregnancies.

A few things can make an early belly scan harder to read, including body weight, bowel gas and a tilted (retroverted) uterus. If the view is unclear, your doctor may add a transvaginal scan for a closer look, which is routine and nothing to worry about.

TAS is used throughout pregnancy: the dating scan at 8 to 12 weeks, the NT scan at 11 to 14 weeks, the anomaly scan at 18 to 22 weeks, and growth scans later on. Our guide to understanding scans, labs and reports walks through what each one checks and how to read the report.

For an early belly scan you may be asked to come with a full bladder, which lifts the uterus into better view. After about 12 weeks this is usually not needed and can be uncomfortable, so follow the centre's specific instructions.

Heart rate on a scan is measured by M-mode or Doppler, with a normal range of 110 to 160 bpm for most of pregnancy. A sustained rate above 160 (tachycardia) or below 110 (bradycardia) is read in the context of gestational age and clinical situation, and may prompt further checks.

Detecting a heartbeat is genuinely reassuring. Once cardiac activity is confirmed at 6 to 7 weeks, the chance of miscarriage falls to roughly 5 to 10 percent, compared with an overall first-trimester risk of about 15 to 20 percent. Every later scan will check that the heartbeat is still present, and an unexpected absence at any stage needs prompt evaluation.

The handheld Doppler is the small device your doctor or midwife presses on your belly at antenatal visits to produce that fast, galloping, whooshing sound. It uses ultrasound to detect the movement of the heart and converts it to audio. The fetal rate (110 to 160 bpm) is about twice your own resting heart rate, which helps tell them apart.

Timing matters. At 10 to 12 weeks the heartbeat can sometimes be found but is inconsistent. By 12 to 14 weeks it is more reliable, by 14 to 16 weeks generally reliable, and by 18 to 20 weeks essentially always detectable in a single (singleton) pregnancy.

Several harmless factors can make the heartbeat hard to find on a given day: your body weight, the baby's position, an anterior placenta cushioning the sound, bowel gas, early gestation, and the operator's experience. Repositioning you and the probe, plus a little patience, usually does the trick. If the Doppler still cannot find it, an ultrasound gives a definitive answer, and most of the time it simply shows a healthy heartbeat the Doppler missed.

Hearing the heartbeat for the first time is, for many, the most emotional moment of early pregnancy, and partners often have a strong reaction too. With your provider's permission, you can record it on your phone as a keepsake. Bringing your partner or a support person to share the moment can be lovely.

Home Doppler devices are sold in India for roughly Rs 2,000 to Rs 8,000, but they are not recommended for monitoring your baby. Without training it is easy to mistake your own pulse or placental flow for the baby's heartbeat, which can give false reassurance, while being unable to find it can cause needless panic. ACOG, RCOG and FOGSI do not advise routine home Doppler use.

The fetal stethoscope, or Pinard horn, is a trumpet-shaped wooden or metal device placed on the mother's abdomen, with the other end at the listener's ear. It transmits the heartbeat directly, without electronics. It was the original tool for listening to a baby and still has a place, especially where equipment is limited.

A Pinard can usually pick up the heartbeat from about 18 to 20 weeks, reliably by 20 to 24 weeks, and easily after 24 weeks in most singleton pregnancies. The same factors that affect a Doppler (body weight, baby's position, an anterior placenta, gestation and operator skill) apply here too.

In India the Pinard is used more in government and rural settings, by ANMs and midwives, in the training of students, and as a backup when a Doppler is unavailable. Some families value the simplicity and human touch, and with permission a partner or family member can sometimes listen too.

Pinard horns cost roughly Rs 200 to Rs 1,500 from medical suppliers. They are harder to use than a Doppler, cannot give an exact rate as easily, and are less suited to very early pregnancy. Many Indian practices sensibly combine modern monitoring with traditional listening for a complete picture.

In late pregnancy, some mothers and partners can even feel or faintly hear the heartbeat with a hand or ear on the belly when the baby is well positioned. It is variable and not a clinical test, but it can be a meaningful way to bond. Our baby bonding guide has more gentle ideas.

Knowing the normal ranges helps you read your reports with confidence. The rate is naturally slow at first, peaks in early pregnancy, then settles.

By gestational age, typical rates are: about 80 to 100 bpm at 5 to 6 weeks; 100 to 120 bpm at 6 to 7 weeks; 130 to 150 bpm at 7 to 8 weeks; a peak of about 160 to 170 bpm at 8 to 10 weeks; and then a settled 110 to 160 bpm from roughly 14 weeks through to birth.

A sustained rate above 160 bpm (tachycardia) in the second or third trimester can be linked to maternal fever, anxiety, an overactive thyroid, certain medicines, or, less commonly, fetal anaemia, infection or low oxygen. A sustained rate below 110 bpm (bradycardia) can relate to a heart-rhythm condition, certain maternal medicines or autoimmune conditions, and sometimes low oxygen. Both warrant evaluation in context.

From the second trimester the heartbeat normally varies by 5 to 25 bpm and shows brief accelerations with movement, both signs of a healthy nervous system and good oxygenation. These are assessed on a non-stress test (NST), which monitors the heartbeat for 20 to 40 minutes and costs roughly Rs 300 to Rs 1,500 in India. A biophysical profile (BPP) combines the NST with an ultrasound of movement, tone, breathing and amniotic fluid.

Irregular rhythms are sometimes picked up. Occasional premature beats are common and usually harmless, while less common rhythm problems may need a fetal cardiology assessment. Specialised Doppler studies of the umbilical and brain blood flow are used when growth restriction or placental problems are suspected.

The most useful thing you can do is attend every scheduled antenatal visit and, from the third trimester, get to know your baby's movement pattern, since a clear drop in movements is one of the most important warning signs (see When to See a Doctor below).

Confirming the heartbeat is a genuine milestone, not just an emotional one. Once cardiac activity is seen at 6 to 7 weeks, the chance of miscarriage falls to about 5 to 10 percent, compared with the overall first-trimester rate of 15 to 20 percent. After a previous loss this reassurance can be enormous.

A very slow early heartbeat (below about 90 bpm at 6 to 7 weeks) is associated with a higher risk of miscarriage in some studies, but it is not a verdict; many such pregnancies go on to do well. A repeat scan a week or so later gives far better information than a single reading.

In a twin or higher-order pregnancy, each baby has its own distinct heartbeat, and finding two separate rates confirms twins. Our twin and multiple pregnancy guide covers the extra monitoring involved.

Routine scans check the structure of the heart, and a detailed fetal echocardiogram (usually at 20 to 24 weeks, costing about Rs 3,000 to Rs 8,000 in India) is offered when there is higher risk, such as a family history of heart defects, maternal diabetes, certain medicines, an abnormal anomaly scan or an increased nuchal translucency on the first-trimester combined screening.

Where a heart condition is found, a diagnosis allows planning, so the baby can be born at a centre with paediatric cardiac care. For families who qualify, the Rashtriya Bal Swasthya Karyakram (RBSK) provides free treatment for eligible children with congenital heart disease at empanelled centres.

One persistent myth deserves to be put to rest: the fetal heart rate does NOT predict whether you are having a boy or a girl. Multiple studies show no link, and both male and female babies sit across the full 110 to 160 bpm range. In India, determining or disclosing fetal sex by any method is prohibited under the PCPNDT Act, 1994.

Not finding a heartbeat when expected is frightening, but it does not always mean a loss. The right next steps depend on how far along you are.

In early pregnancy (6 to 8 weeks), the most common explanation is that the pregnancy is simply earlier than your dates suggested. Other possibilities include an embryo that has not yet developed cardiac activity, a blighted ovum, an early demise, or an ectopic pregnancy. The usual approach is a repeat scan in 7 to 14 days, often with beta-hCG blood tests, rather than rushing to a conclusion.

If a heartbeat was seen before and is now absent, this is a missed miscarriage, sometimes found as late as 12 to 13 weeks. Your doctor will talk you through the options (expectant, medical or surgical management). Our guide to the types of miscarriage and recovery explains what each involves.

If a Doppler cannot find the heartbeat at a 10 to 14 week visit, this is usually due to position, body habitus or gestation rather than a problem, and an ultrasound almost always shows a healthy heartbeat. In the second or third trimester, an absent heartbeat is treated as urgent and confirmed promptly with ultrasound.

How news is delivered matters. You deserve a private setting, time to take it in, a clear explanation, emotional support and written information about next steps. For major findings such as a suspected loss, a second opinion is entirely reasonable and good doctors welcome it.

Grief after pregnancy loss is real at any gestation, and the common tendency to minimise early loss is unhelpful. Allow yourself what you need. If low mood or anxiety is affecting daily life, reach out; our guide on pregnancy anxiety and depression lists Indian support options, and platforms such as Wysa, YourDost and iCall can help. Medically, conception can usually be attempted after the first normal period, but emotional readiness is yours to set.

Trust your instincts and seek care promptly if anything feels wrong, rather than relying on a home device. Get medical advice the same day for any of the following.

In early pregnancy, contact your doctor for vaginal bleeding, severe one-sided or lower abdominal pain, or shoulder-tip pain with dizziness or fainting (which can signal an ectopic pregnancy and needs urgent assessment).

Later in pregnancy, seek care the same day for a noticeable reduction or change in your baby's movements, vaginal bleeding, severe or persistent abdominal pain, a gush or trickle of fluid suggesting your waters have broken, a severe headache with visual changes or swelling, or a fever.

If a heartbeat could not be found on a Doppler at an antenatal visit, ask for an ultrasound for confirmation rather than waiting and worrying. And if you ever feel dismissed or rushed about a serious finding, you are entitled to a clear, compassionate explanation and to a second opinion.

• ACOG: Early Pregnancy Loss (Clinical guidance on ultrasound criteria for viability)
• NHS: Ultrasound scans in pregnancy
• RCOG: Information on early pregnancy assessment and care
• WHO: Recommendations on antenatal care for a positive pregnancy experience
• PCPNDT Act, 1994, Ministry of Health and Family Welfare, Government of India
• Rashtriya Bal Swasthya Karyakram (RBSK), National Health Mission, India