Fetal heart rate by week
Check fetal heart rate by week, learn what affects a reading, and understand why a home result cannot diagnose your baby's health.
Fetal heart rate by week
Use the tool below to view general fetal heart rate information for your stage of pregnancy. A heartbeat reading is only one piece of clinical information, and this tool cannot determine whether your baby is healthy or in distress. Contact your maternity team if you are worried about a reading, symptoms, or a change in movement.
What fetal heart rate by week can tell you
Fetal heart rate changes as pregnancy develops, so gestational age matters when a clinician interprets a reading. However, there is not one exact “correct” heart rate for every week. A result is considered alongside how it was measured, whether the heart rate changes over time, your symptoms, and other pregnancy findings.
The supplied medical sources do not provide a week-by-week fetal heart rate range. For that reason, this page does not publish unsourced cutoff figures or suggest that a single number can confirm that everything is normal.
Pregnancy weeks are usually counted from the start of the last menstrual period rather than from conception. The conventional estimated due date is 280 days, or 40 weeks, from the first day of the last menstrual period (ACOG, 2017). If an early ultrasound changed your estimated due date, use the gestational age recorded by your clinician.
A fetal heart rate tool is best treated as educational context. It is not a substitute for listening with clinical equipment, reviewing a tracing, performing an ultrasound, or speaking with a qualified maternity professional.
Fetal heart rate changes at a glance
The table explains how to think about fetal heart rate across pregnancy without assigning unsupported ranges. The most useful interpretation comes from a clinician who knows your gestational age and the circumstances of the measurement.
| Stage | What the tool can explain | Important limit |
|---|---|---|
| Very early pregnancy | Gestational dating strongly affects what may be visible or measurable. | A scan performed too early may not provide a clear answer. Follow-up timing should come from your clinician. |
| Later early pregnancy | Heart rate can change as the fetal heart and nervous system develop. | A home listening device cannot replace ultrasound findings or clinical interpretation. |
| Middle pregnancy | A clinician may listen during routine prenatal care and consider the rate in context. | A brief reading does not show the same information as continuous monitoring. |
| Late pregnancy | Clinicians may consider the baseline, changes in rate, movement, and your symptoms. | A number without a clinical tracing or examination can be misleading. |
| Labor | Heart rate may be assessed around contractions to understand how the baby is responding. | Timing contractions and assessing fetal well-being are separate tasks. |
Do not use the table to label a reading as safe or unsafe. If your clinician has given you a personal monitoring plan, follow that plan instead of general online information.
How to use the fetal heart rate tool
- Choose the pregnancy week that matches the gestational age in your prenatal record.
- Read the developmental context shown by the widget rather than looking for one perfect number.
- Note where the reading came from, such as a prenatal visit, ultrasound report, hospital monitor, or home device.
- Consider whether the result was brief, repeated, or observed over time by a clinician.
- Ask your maternity team about anything you do not understand, especially wording in an ultrasound or monitoring report.
If you are calculating pregnancy weeks from your last menstrual period, remember that the conventional calculation uses 280 days from the first day of that period (ACOG, 2017). Dating may be less straightforward with irregular cycles, uncertain dates, assisted reproduction, or a revised ultrasound due date.
Do not delay care while trying different weeks or repeatedly checking a home device. A tool cannot evaluate bleeding, pain, fluid loss, reduced movement, or other symptoms that may require prompt assessment.
How clinicians measure a fetal heartbeat
A fetal heartbeat may be assessed by ultrasound, a handheld listening device used in prenatal care, or electronic monitoring. These methods do not provide identical information, and a value taken from one method should not automatically be compared with a value from another.
A brief listening check can estimate the rate at that moment. Electronic monitoring may show a pattern over time, including changes that occur with movement or contractions. Ultrasound can provide information about cardiac activity while also showing pregnancy location, growth, and other structures appropriate to the scan.
Home Doppler devices have important limits. It can be difficult to distinguish the fetal heartbeat from the pregnant person’s pulse, placental blood flow, or other sounds. Finding a heartbeat also does not rule out every pregnancy problem, while being unable to find one does not establish that something is wrong.
If you already have a reading, tell your clinician who measured it, which device was used, and why it was checked. That context is often more useful than entering an isolated value into an online tool.
Why a fetal heart rate reading may differ
Fetal heart rate is not expected to remain fixed. A reading may vary with fetal activity, sleep, gestational age, medication, maternal health, and what was happening during the measurement. Equipment position and signal quality can also affect the displayed result.
A short measurement can miss the broader pattern. Clinicians may look at a baseline and how the rate changes rather than treating the display at one instant as the whole result. During labor, they may also consider how changes relate to contractions.
Gestational dating can create another apparent difference. If you select a week based on an uncertain last menstrual period but your prenatal record uses ultrasound dating, the tool’s context may not match the dating used by your care team.
Do not compare readings from different pregnancies as if they should be the same. Your clinician may interpret a result differently based on your medical history, pregnancy complications, symptoms, and previous assessments.
When to contact your maternity team
Contact your maternity team promptly if you are concerned about reduced or changed fetal movement, bleeding, leaking fluid, significant pain, feeling seriously unwell, or a reading your clinician told you requires review. Seek emergency help for severe symptoms or whenever your care team has instructed you to do so.
Movement matters separately from heart rate. One commonly cited movement-counting approach uses 10 distinct movements within 2 hours and advises contacting a provider if fewer are felt during focused counting (Cleveland Clinic, 2026). Follow the method your own clinician recommends, because local guidance and individual care plans can differ.
Do not rely on a home heartbeat check to reassure yourself after movement has decreased. Hearing a sound that appears to be a heartbeat cannot confirm fetal well-being or replace an assessment.
Near labor, Contraction Timer IO can record contraction duration and spacing on iPhone, Apple Watch, Android, or the web. Contraction records do not measure fetal heart rate, diagnose labor, or show how a baby is tolerating contractions.
Frequently asked questions
What is a normal fetal heart rate by week?
There is no single exact heart rate that applies to every pregnancy week. Interpretation depends on gestational age, the measurement method, whether the rate changes over time, and the wider clinical picture. The supplied sources do not contain a sourced week-by-week range, so this page does not provide unsupported cutoff figures. Ask your clinician to explain the range used in your care setting.
Does fetal heart rate change as pregnancy progresses?
Yes, fetal heart rate can change as the fetal heart and nervous system develop. It also varies with activity, sleep, medications, maternal health, and measurement conditions. A clinician will usually interpret the rate using your recorded gestational age and may consider a pattern over time rather than an isolated display from a home device.
Can fetal heart rate predict whether the baby is a boy or girl?
No, fetal heart rate is not a reliable way to predict fetal sex. Differences between individual readings can reflect activity, sleep, gestational age, or how the measurement was taken. If you want information about fetal sex, ask your clinician which screening or diagnostic options are available and what their limitations are.
Why could my clinician not find the heartbeat?
It may be too early, the pregnancy dates may differ from your estimate, or fetal and placental position may make listening difficult. Equipment and technique also matter. An unsuccessful listening attempt does not provide a diagnosis by itself. Your clinician may recommend waiting, repeating the assessment, or using ultrasound depending on your dates, symptoms, and medical history.
Can I check fetal heart rate with a home Doppler?
You may be able to hear sounds with a home Doppler, but you may not know whether you are hearing the fetus, your own pulse, or placental blood flow. Finding a sound cannot confirm fetal well-being, and not finding one cannot diagnose a problem. Never let a home check delay care for reduced movement, bleeding, pain, fluid loss, or other concerns.
Is fetal heart rate the same as kick counting?
No, fetal heart rate assessment and movement counting measure different things. One commonly cited kick-count method looks for 10 distinct movements within 2 hours (Cleveland Clinic, 2026), but your clinician may provide different instructions. Do not replace movement monitoring with a home heartbeat check, especially if your baby’s usual movement pattern has changed.
Does a fetal heart rate reading show whether my baby is in distress?
Not by itself. Clinicians may consider the baseline, changes over time, movement, contractions, symptoms, gestational age, and other findings. A brief number from a home device or appointment cannot reproduce a full clinical assessment. If you were told a reading was unusual, or you have concerning symptoms, contact your maternity team for individualized advice.
Typical fetal heart rate patterns
Fetal heart rate usually rises early, peaks around 9-10 weeks, then gradually slows toward term.
These ranges describe typical patterns, not diagnostic cut-offs; a single reading cannot confirm whether a baby is healthy.
If you are concerned about heart rate or movements, contact your maternity team urgently and follow NICE fetal-monitoring guidance.
| Stage | Typical pattern |
|---|---|
| 6-7 weeks | 100-140 bpm |
| 8-10 weeks | 140-180 bpm |
| 11-14 weeks | 135-170 bpm |
| 15-27 weeks | 120-160 bpm |
| 28+ weeks | 110-160 bpm |