Pulse is one of the vital signs that can help parents and healthcare professionals quickly assess a child’s condition. However, children’s heart rate differs from that of adults and can vary considerably depending on age.
Newborns typically have much higher heart rates than older children. As children grow, their resting heart rate generally decreases. In addition, a child’s heart rate may increase temporarily after running, crying, having a fever, or feeling anxious without necessarily indicating heart disease.
So, what is a normal heart rate for children? What should a 12-year-old child’s heart rate be? When is a fast heart rate in children a sign that requires medical evaluation?
What Is a Children’s Heart Rate?
Pulse is the number of times the heart beats in one minute, usually expressed in beats per minute (bpm).
In children, heart rate reflects cardiovascular activity but is strongly influenced by age, physical activity, emotional state, body temperature, and overall health.
Compared with adults, children’s heart rate is generally higher, particularly in newborns and young children. As children grow older, their resting heart rate tends to decrease. The American Heart Association also notes that children’s heart rates vary with age; older children and teenagers typically have resting heart rates of approximately 60–100 beats per minute.
Therefore, the adult heart rate range should not be used to assess newborns, young children, or school-age children.
What Is a Normal Heart Rate for Children?
There is no single heart rate range that applies to every child. When assessing children’s heart rate, both the child’s age and their condition at the time of measurement should be considered.
A reference table used by Cleveland Clinic for heart rate in awake, non-active children shows the following ranges:
| Age | Reference resting heart rate |
|---|---|
| 0–3 months | 110–160 bpm |
| 3–6 months | 100–150 bpm |
| 6–12 months | 90–130 bpm |
| 1–3 years | 80–125 bpm |
| 3–6 years | 70–115 bpm |
| 6–12 years | 60–100 bpm |
| 12–18 years | 60–100 bpm |
These are reference ranges, not diagnostic thresholds. Medical references may provide slightly different ranges depending on age classification, measurement conditions, and the population studied.
Therefore, parents should not conclude that their child has a medical condition based solely on a single heart rate reading.
How Does a Child’s Heart Rate Change With Age?
Newborns
Newborns have significantly higher heart rates than older children. Pediatric reference tables indicate that a newborn’s heart rate while awake may range from approximately 100–190 bpm or higher, depending on the neonatal period and the reference source.
Therefore, applying adult heart rate standards to newborns can easily lead parents to mistakenly believe that the baby has an abnormally fast heart rate.
Young Children
Between approximately 1 and 6 years of age, resting heart rate generally decreases compared with infancy. However, children in this age group frequently run, cry, or become excited, which can cause their heart rate to increase temporarily.
If a child has just been physically active or crying, allow them to rest and calm down before measuring their heart rate again.
School-Age Children
In children around 6–12 years old, resting heart rate is generally lower than in younger children. Some reference tables indicate a range of approximately 60–100 bpm when the child is awake and at rest.
At this age, parents can more easily monitor their child’s heart rate, particularly if the child complains of fatigue, palpitations, dizziness, or shortness of breath.
What Is a Normal Heart Rate for a 12-Year-Old?
For a 12-year-old child’s heart rate, many medical references classify children of this age as older children or early adolescents. A commonly used reference range is 60–100 bpm at rest.
However, a 12-year-old may have a lower heart rate while sleeping or if they are physically fit. Conversely, their heart rate may increase after exercise, during anxiety, with dehydration, or when they have a fever.
Therefore, a single heart rate reading is not enough to determine whether a 12-year-old has a cardiovascular problem.
What Factors Can Increase a Child’s Heart Rate?
A child’s heart rate may temporarily increase for many physiological reasons. Common factors include:
- Running or physical activity.
- Crying or becoming upset.
- Anxiety, fear, or emotional stress.
- Fever.
- Dehydration.
- Pain.
- Infection or illness.
- Certain medications.
- Certain heart rhythm disorders.
Anxiety, dehydration, exercise, fever, illness, and stress can all increase a child’s heart rate.
Therefore, when parents notice a fast heart rate in a child, the first step should not be to assume that the child has heart disease. Instead, consider the child’s current condition and measure the heart rate again after the child has rested.
Read more: Fast Heart Rate (Tachycardia): Causes, Symptoms, and When to Seek Care
When Should a Fast Heart Rate in Children Be a Concern?
A fast heart rate in children may be a normal physiological response if it occurs after running, crying, or developing a fever and gradually decreases after the underlying trigger resolves.
However, parents should pay attention if the fast heart rate:
- Occurs while the child is resting.
- Persists or happens repeatedly.
- Has no obvious explanation such as exercise, fever, or emotional distress.
- Is accompanied by a sensation of a racing or pounding heart.
- Occurs with dizziness or lightheadedness.
- Is accompanied by shortness of breath.
- Occurs with chest pain or discomfort.
- Causes unusual fatigue or reduced ability to exercise.
- Is accompanied by fainting or near-fainting.
Some heart rhythm disorders in children can cause the heart to beat too fast or too slowly. Evaluation should take into account the child’s age and accompanying clinical symptoms.
Is a Low Heart Rate in Children a Cause for Concern?
Not every case of a low child’s heart rate is abnormal.
Some healthy children, particularly those who participate in regular physical activity or sports, may have a lower resting heart rate without having an underlying health problem. The American Heart Association notes that a physically fit teenager may have a resting heart rate of around 50 bpm and still be healthy.
However, a low heart rate should be evaluated if it occurs together with:
- Unusual fatigue.
- Dizziness.
- Lightheadedness or fainting.
- Shortness of breath.
- Reduced exercise tolerance.
- Chest pain.
- A history of heart disease or heart surgery.
In these situations, a doctor may need to determine whether the low heart rate is related to an abnormality in the heart’s electrical conduction system or another cardiovascular condition.
How to Measure a Child’s Heart Rate at Home
Parents can check a child’s pulse by gently feeling the pulse at the wrist, inside the elbow, or on the side of the neck.
To obtain a more useful measurement:
- Have the child sit or lie down and rest for several minutes.
- Do not measure immediately after the child has been running, crying, or exercising vigorously.
- Use your index and middle fingers to feel the pulse.
- Count the beats for 60 seconds if possible.
- Record the time and circumstances of the measurement.
- If the result seems unusual, allow the child to rest and measure again.
Most importantly, do not assess a child’s heart rate based on a single reading alone.
How Are Heart Rate and Blood Pressure Related in Children?
Heart rate and blood pressure in children are two different measurements.
Heart rate indicates how many times the heart beats per minute, while blood pressure reflects the pressure of blood against the walls of the arteries.
Both are important vital signs, but heart rate cannot be used as a substitute for blood pressure, or vice versa. In children, blood pressure should also be interpreted according to age, sex, and height rather than simply applying adult standards.
Therefore, when monitoring a child’s health, particularly in children with underlying conditions or unusual symptoms, healthcare professionals may assess heart rate, blood pressure, respiratory rate, and other vital signs together.
When Should a Child See a Doctor?
Parents should have their child evaluated if an abnormal heart rate occurs repeatedly or is accompanied by symptoms such as dizziness, fainting, shortness of breath, chest pain, unusual fatigue, or reduced exercise tolerance.
If a child develops a very fast or abnormal heart rate accompanied by fainting, severe difficulty breathing, chest pain, or rapidly worsening symptoms, seek urgent medical attention.
A doctor may ask about when the symptoms occur, the child’s medical history, medications, and the circumstances in which the abnormal heart rate was observed. Depending on the situation, the child may undergo an electrocardiogram (ECG) or other methods of heart rhythm monitoring.
Conclusion
Children’s heart rate varies according to age and the child’s physical and emotional state. Newborns generally have higher heart rates, while resting heart rate gradually decreases as children grow. For children approximately 6–18 years old, a resting heart rate of 60–100 bpm is a commonly used reference range, but it should not be considered an absolute threshold for every child.
In particular, a 12-year-old child’s heart rate may normally fall within the range of 60–100 bpm at rest. However, accurate interpretation requires consideration of the child’s age, physical condition at the time of measurement, fitness level, and accompanying symptoms.
If a child develops a fast heart rate that persists while resting, recurrent abnormal heart rates, or symptoms such as dizziness, shortness of breath, chest pain, or fainting, parents should seek medical evaluation to determine the underlying cause rather than simply monitoring the child at home or giving medication without medical advice.
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