A newborn’s heart rate is estimated using three main approaches: listening with a stethoscope, feeling for a pulse at the umbilical cord or upper arm, or attaching an electronic monitor. The method chosen depends on the setting, whether it’s a routine checkup or an urgent moment right after birth. A healthy newborn’s resting heart rate typically falls between 100 and 205 beats per minute.
The 6-Second Counting Method
Regardless of whether you’re listening with a stethoscope or feeling a pulse, the math works the same way. Count the number of heartbeats you detect in 6 seconds, then multiply by 10. That gives you an estimate in beats per minute. This is known as the “6-second rule,” and it’s taught in the Neonatal Resuscitation Program as the standard shortcut for quick assessment.
The reason for such a short counting window is speed. In the minutes after birth, a care team needs to know the heart rate quickly to decide whether the baby needs help. Waiting a full 60 seconds to count isn’t practical when every second matters.
Listening With a Stethoscope
Auscultation, or listening through a stethoscope, is more accurate than feeling for a pulse by hand. The stethoscope is placed on the left side of the baby’s chest. Research on children under two years old found that the area between the nipple and the bottom of the ribcage on the left side produced the clearest heart sounds, scoring roughly three times higher for sound quality than the area above the nipple.
Heart rate is also the single most important component of the Apgar score, the quick health check performed at 1 and 5 minutes after birth. For that assessment, heart rate is evaluated by stethoscope. A rate above 100 bpm earns the full 2 points, a rate below 100 bpm earns 1 point, and no detectable heartbeat scores 0.
Feeling for a Pulse by Hand
Palpation is the fastest hands-on option because it requires no equipment. In simulated neonatal resuscitations, 72% of all heart rate checks were done by feeling the base of the umbilical cord, while only 13% used a stethoscope alone. The cord stump is easy to access in the first minutes of life: the assessor gently holds the base of the cord between two fingers and counts the pulsations.
The trade-off is accuracy. Among heart rate assessments that were tapped out visibly on video, only 56% matched the actual rate. Accuracy varied depending on the baby’s true heart rate. When the heart rate was critically low (below 60 bpm), palpation was correct 87% of the time. But in the middle range of 60 to 99 bpm, accuracy dropped to just 57%. At rates above 100 bpm, it was 68%. In other words, the faster the heart beats, the harder it becomes to count reliably by touch alone.
For infants beyond the immediate delivery period, the brachial pulse is the preferred site. You lay the baby on their back with one arm bent so the hand is near the ear, then gently press two fingers (never the thumb, which has its own pulse) on the inner arm between the shoulder and the elbow until you feel a beat.
Electronic Monitors in the Delivery Room
When precision matters most, electronic monitoring is the gold standard. Two devices are commonly used: ECG (electrocardiography) monitors and pulse oximeters.
ECG works by detecting the electrical signals that trigger each heartbeat. It provides a reliable reading within seconds of the electrodes being placed on the baby’s skin. Pulse oximetry works differently. It measures the mechanical pressure wave of blood flowing through tissue, which means there’s an inherent delay. Studies show pulse oximetry underestimates the true heart rate in roughly 61% of newborns during the first several minutes after birth. That underestimation can persist for up to seven minutes after the sensor is applied.
Dry-electrode ECG devices designed specifically for newborns (placed directly on the baby’s chest or abdomen without gel or adhesive pads) have been shown to be equally accurate as conventional ECG and superior to pulse oximetry during resuscitation. Current neonatal resuscitation guidelines recommend attaching a cardiac monitor whenever a more accurate, continuous heart rate reading is needed, particularly if the baby requires breathing support or more advanced interventions.
Why Heart Rate Is the Key Number
Heart rate is the primary indicator of how well a newborn is transitioning to life outside the womb. A rate consistently above 100 bpm signals that the baby’s heart and lungs are working together effectively. A rate below 100 bpm prompts the care team to begin assisted ventilation. If the rate stays below 60 bpm after 30 seconds of effective ventilation, that threshold triggers chest compressions and supplemental oxygen.
The normal range for a newborn in the first four weeks of life is broad: 100 to 205 bpm when awake. Crying or fussing can push the rate toward the upper end, while deep sleep can bring it lower. This wide range is normal and reflects how responsive a newborn’s cardiovascular system is to stimulation, temperature changes, and activity.
Which Method Is Most Reliable
Each method has a clear place. Umbilical cord palpation is the quickest first check in the delivery room because it needs no equipment and can be done within seconds of birth. Stethoscope auscultation is a meaningful step up in accuracy and remains the standard tool for routine newborn exams and Apgar scoring. ECG monitoring is the most precise option and is recommended whenever the clinical situation calls for continuous, real-time tracking.
For parents checking their baby’s heart rate at home, the brachial pulse on the inner upper arm is the most accessible site. Count beats for 6 seconds and multiply by 10, or count for a full 15 seconds and multiply by 4 if you want a slightly more stable estimate. If the rate consistently falls outside the 100 to 205 bpm range when the baby is calm and awake, that’s worth mentioning to your pediatrician.