When a baby is born with a preventable injury, families often have questions about what happened during labor and delivery. One of the most important tools doctors use to assess a baby’s well-being before birth is fetal heart monitoring. Understanding how this monitoring works, what doctors look for, and what the results mean can help families make sense of their experience and recognize when the standard of care may not have been met.

Fetal heart monitoring is used in nearly every hospital birth in the United States. When it is performed, interpreted, and acted upon correctly, it provides critical information that can guide medical decisions and help prevent serious complications. But like any medical tool, its effectiveness depends on proper use, timely interpretation, and appropriate response.

What is Fetal Heart Monitoring?

Fetal heart monitoring is the process of tracking a baby’s heart rate and rhythm during pregnancy and labor. Its primary goal is to assess how well the baby is tolerating the stresses of pregnancy and labor to identify early warning signs of distress, oxygen deprivation, or other problems that could lead to injury.

The heart rate pattern tells doctors whether the baby is getting enough oxygen and blood flow through the umbilical cord and placenta. Changes in the heart rate can signal that the baby is struggling and may need immediate help, such as repositioning the mother, providing oxygen, stopping certain medications, or proceeding with an emergency cesarean section.

Fetal heart monitoring is now a standard part of obstetric care across the country and is used in hospitals throughout New York and the United States.

Methods of Monitoring

There are several ways to monitor a baby’s heart rate, ranging from simple periodic checks to continuous electronic tracking.

Intermittent Auscultation

This method involves a nurse or doctor listening to the baby’s heartbeat at regular intervals using a handheld Doppler device or a fetoscope (a specialized stethoscope). The provider listens for a set amount of time, often before, during, and after contractions, to check that the heart rate is normal and stable. This approach is often used in low-risk pregnancies and labors.

Continuous Electronic Fetal Monitoring

Also called EFM or cardiotocography, this method uses sensors placed on the mother’s abdomen to continuously record the baby’s heart rate and the timing of uterine contractions. The information is displayed on a screen and printed on paper strips, creating a visual record that the medical team can review in real time.

In some cases, particularly if external monitoring is not picking up a clear signal, doctors may use an internal monitor. This involves placing a small electrode directly on the baby’s scalp through the cervix. Internal monitoring provides more accurate readings but is more invasive and can only be used once the membranes have ruptured.

Advanced Techniques

In certain high-risk situations, additional monitoring tools may be used. These include fetal scalp blood sampling to check pH levels (indicating oxygen status), fetal pulse oximetry to measure oxygen saturation, and Doppler ultrasound to assess blood flow in the umbilical cord or other vessels. These are not routine but may be important when standard monitoring raises concerns.

When Fetal Monitoring is Used

Fetal heart monitoring is standard during labor, especially for women with high-risk pregnancies. Risk factors that often lead to more intensive monitoring include:

Diabetes or gestational diabetes
High blood pressure or preeclampsia
Suspected intrauterine growth restriction
Preterm labor
Post-term pregnancy
Previous cesarean delivery
Twins or multiples
Abnormal amniotic fluid levels
Maternal infection or fever

Monitoring is also used before labor begins, particularly in the third trimester, to check on babies who may be at risk for stillbirth or other complications. These antepartum tests, such as the nonstress test or biophysical profile, help doctors decide if early delivery is needed.

What Doctors Look For

Interpreting fetal heart rate patterns requires training and experience. Medical staff look at several key features to determine whether a baby is doing well or showing signs of trouble.

Baseline Heart Rate

The baseline fetal heart rate is the average rate between contractions, measured over at least a two-minute window. A normal baseline is between 110 and 160 beats per minute. A heart rate consistently above or below this range may indicate a problem, such as fetal stress, infection, medication effects, or heart abnormalities.

Variability

Variability refers to the small, continuous changes in heart rate from beat to beat. These fluctuations are a sign that the baby’s nervous system is functioning well and that the baby is receiving adequate oxygen. Moderate variability is considered reassuring. Minimal or absent variability, especially when sustained, can be a warning sign of distress or oxygen deprivation.

Accelerations

Accelerations are temporary increases in the heart rate, usually in response to the baby’s movement. They are a positive sign of fetal well-being and indicate that the baby is reacting normally to stimulation.

Decelerations

Decelerations are temporary drops in the heart rate. Not all decelerations are concerning. Some patterns are normal and expected, particularly in active labor. However, certain types of decelerations suggest that the baby may not be getting enough oxygen or that there is a problem with the umbilical cord or placenta. Prolonged, recurrent, or severe decelerations require prompt evaluation and may demand urgent intervention.

Category System

To standardize interpretation and guide decision-making, the American College of Obstetricians and Gynecologists (ACOG) uses a three-tier classification system:

Category I: Normal and strongly predictive of normal fetal status at that time. No specific action needed.
Category II: Indeterminate. The pattern does not clearly predict abnormal status but requires evaluation, continued surveillance, and possibly further testing or intervention.
Category III: Abnormal. Associated with abnormal fetal acid-base status and risk of injury. Prompt evaluation and intervention, including possible emergency delivery, are required.

Most tracings fall into Category II, which can create challenges for interpretation, communication, and decision-making.

Benefits and What the Evidence Shows

Electronic fetal monitoring was introduced decades ago with the hope that it would help prevent cerebral palsy, stillbirth, and other serious outcomes. The evidence since then has been mixed.

Studies have shown that continuous electronic monitoring can reduce the rate of neonatal seizures, particularly in high-risk deliveries. There is also some evidence of modest reductions in neonatal mortality, especially in preterm births.

However, EFM has not been shown to reduce rates of cerebral palsy, long-term neurological disability, or admission to the neonatal intensive care unit in low-risk pregnancies. At the same time, the use of continuous monitoring has been associated with higher rates of cesarean sections and assisted deliveries using forceps or vacuum, as well as increased maternal infection risk.

This does not mean fetal monitoring is not valuable. It means that the tool must be used carefully, interpreted accurately, and combined with clinical judgment and an understanding of each mother’s and baby’s unique circumstances.

Newer technologies, including computer-assisted analysis and artificial intelligence systems designed to detect subtle patterns, are being studied and may eventually improve the accuracy and consistency of monitoring. For now, national guidelines emphasize the importance of skilled human interpretation and teamwork.

Limitations and Risks of Errors

Fetal heart monitoring is not perfect. One of the biggest challenges is that different doctors and nurses may interpret the same tracing differently. Studies have documented significant variability in how providers classify and respond to fetal heart rate patterns, even among experienced clinicians.

This inconsistency can lead to delays in recognizing distress or, conversely, to unnecessary interventions when the baby is actually fine. The high rate of false positives, where tracings appear concerning but the baby is not in danger, has contributed to rising cesarean rates without always improving outcomes.

When fetal heart monitoring is misinterpreted or when warning signs are not acted upon quickly enough, the consequences can be devastating. Prolonged oxygen deprivation can result in hypoxic-ischemic encephalopathy (HIE), cerebral palsy, developmental delays, seizures, or even death.

Hospitals are expected to have protocols in place to ensure that:

Staff are properly trained in interpreting fetal heart rate patterns
Monitoring is continuous when indicated and reassessed when conditions change
Abnormal tracings are communicated immediately to the attending physician
Emergency response teams are available and prepared to act quickly when needed
Documentation is thorough, time-stamped, and accurate

ACOG and other leading medical organizations require ongoing education and competency assessments for labor and delivery staff to reduce errors and improve outcomes.

Use and Outcomes in New York

The use of continuous electronic fetal monitoring has become standard practice across New York hospitals, as it has nationwide. Between 1990 and 2004, routine use of EFM during labor increased from 73% to 86% in the United States, and it is now used in the vast majority of births.

New York’s major medical centers and perinatal care networks follow national guidelines and emphasize team-based care, including obstetricians, midwives, nurses, neonatologists, and anesthesiologists working together to interpret monitoring data and respond appropriately.

Despite widespread use, fetal monitoring cannot prevent all birth injuries. Some injuries occur despite appropriate monitoring and care. Others occur because of system failures, communication breakdowns, or delays in response. New York State and many individual hospitals have invested in quality improvement initiatives aimed at reducing preventable birth injuries, including enhanced training in fetal monitoring, simulation drills, and standardized emergency protocols.

Families in New York have access to some of the country’s leading maternal-fetal medicine programs and neonatal intensive care units, but outcomes can still vary by hospital, staffing, provider experience, and individual circumstances.

Family Education and Support

Families have the right to understand how their baby is being monitored and what the monitoring results mean. Before labor begins, or early in the process, the medical team should explain:

What type of monitoring will be used and why
What the monitors are measuring
What the medical team is watching for
What will happen if the baby shows signs of distress

In some cases, families may have a choice between intermittent auscultation and continuous monitoring, especially in low-risk pregnancies. Understanding the benefits and limitations of each option can help families make informed decisions that align with their values and preferences.

When abnormal heart rate patterns are identified, families should be kept informed about what is happening, what steps are being taken, and why. Emergencies can be frightening, but clear communication helps families feel more prepared and supported.

After delivery, if there were concerns about the baby’s heart rate or other complications, families should be given information about what happened, what follow-up care is recommended, and where they can turn for additional support. Babies who experienced distress may benefit from neurodevelopmental follow-up, early intervention services, or specialty care to monitor for any developmental delays or long-term effects.

Available Resources and Support

At NYBirthInjury.com, we provide trusted information to help families understand birth injuries, the medical care involved, and the support options available. We know that navigating these issues can be overwhelming, and we are here to offer clear, compassionate guidance.

If your baby experienced distress during labor or was injured despite fetal monitoring, you are not alone. There are medical specialists, early intervention programs, support groups, and other resources that can help your family move forward.

Understanding what happened and why is an important part of that process, and we are here to help you find the answers and support you need.

Fetal Heart Monitoring