Birth Injuries: What the Fetal Monitor Strip Actually Shows

A birth defect is a condition that develops during pregnancy, often genetic or environmental. A birth injury is harm caused during labor and delivery, frequently by preventable failures in obstetric care: delayed cesarean, mismanaged shoulder dystocia, improper use of forceps or vacuum, missed signs of fetal distress, or failure to recognize maternal hemorrhage.

The category matters because birth defects (Down syndrome, spina bifida, congenital heart disease) typically have no malpractice cause and the question for families is what care the child needs going forward. Birth injuries (hypoxic ischemic encephalopathy from oxygen deprivation, Erb's palsy from shoulder dystocia mismanagement, skull fracture from instrument injury) often have a preventable cause that the medical record will document if you know where to look.

Continuous electronic fetal monitoring (EFM) became standard in U.S. obstetrics in the 1970s. The two channels record fetal heart rate (the upper trace) and uterine contractions (the lower trace). The strip is generated continuously throughout labor and is preserved in the medical record. In a birth injury case, the strip is often the most important single piece of evidence.

The standardized framework for interpreting EFM comes from the 2008 National Institute of Child Health and Human Development (NICHD) workshop. Every U.S. labor and delivery unit teaches and documents using NICHD terminology. Defense experts who do not use it will lose credibility quickly.

Four features of the fetal heart rate trace matter most:

Baseline rate. The average heart rate over a 10-minute window, excluding accelerations, decelerations, and marked variability. Normal is 110 to 160 beats per minute. Below 110 is bradycardia, above 160 is tachycardia.

Variability. The peak-to-trough amplitude of beat-to-beat variation in the baseline. Absent variability means undetectable. Minimal is 5 bpm or less. Moderate, the normal finding, is 6 to 25 bpm. Marked is more than 25 bpm. Moderate variability is one of the most reassuring features on the strip: it strongly suggests the fetus has intact central nervous system function and normal oxygenation.

Accelerations. Abrupt increases of 15 bpm above baseline lasting at least 15 seconds. Accelerations are reassuring.

Decelerations. The most informative finding. Early decelerations mirror contractions and are typically benign (head compression). Late decelerations begin after the start of a contraction and recover after it ends; recurrent late decelerations suggest uteroplacental insufficiency and fetal hypoxia. Variable decelerations are abrupt drops that vary in timing and shape; recurrent variables suggest cord compression. A prolonged deceleration lasting 10 minutes or more becomes a baseline change.

The 2008 NICHD workshop set the three-tier system every obstetric provider in the United States uses. The 2025 ACOG Clinical Practice Guideline No. 10 retained it.

Category I (normal) requires all of the following: baseline 110 to 160 bpm, moderate variability, no late or variable decelerations. Early decelerations and accelerations are permitted. Category I tracings strongly predict normal fetal acid-base status. Normal labor management.

Category III (abnormal) is either of two patterns: absent baseline variability with recurrent late decelerations, recurrent variable decelerations, or bradycardia; or a sinusoidal pattern (a smooth sine-wave-like undulation persisting at least 20 minutes, classically associated with severe fetal anemia). Category III strips predict abnormal fetal acid-base status. The 2025 ACOG guideline recommends expedited delivery if Category III does not resolve with intrauterine resuscitation.

Category II (indeterminate) is everything else. The vast majority of intrapartum strips are Category II at some point. This is where malpractice cases get fought: what was going on within the Category II strip, what intrauterine resuscitation was tried, when did it become clear that the strip would not return to Category I, and when should the team have moved to delivery.

ACOG's Clinical Practice Guideline No. 10, published in Obstetrics & Gynecology in October 2025, replaced the earlier Practice Bulletins 106 (2009) and 116 (2010). For litigation purposes the current standard of care is the 2025 guideline; defense experts citing the 2009 bulletin are out of date.

Key changes: ACOG now recommends initial intrauterine resuscitation measures for Category II tracings before moving to cesarean. These include maternal repositioning, intravenous fluid bolus, amnioinfusion, reduction or cessation of oxytocin, and correction of maternal hypotension. The guideline recommends against routine maternal oxygen administration for Category II or III tracings absent maternal hypoxia, a meaningful change from prior decades of practice in which oxygen was applied reflexively.

For Category III tracings unresponsive to resuscitation, the guideline calls for expedited delivery, with the recommendation that decision-to-delivery should ideally occur within 30 minutes when an indicated cesarean is required.

The widely cited "30-minute decision-to-incision" standard comes from older ACOG and American Academy of Pediatrics guidance that hospitals offering obstetric services should be capable of performing cesarean within 30 minutes of the decision. It is a hospital resource standard, not an absolute clinical mandate that every non-reassuring strip requires delivery in 30 minutes.

In cases of acute catastrophic events (cord prolapse, placental abruption, uterine rupture, sustained Category III bradycardia), shorter intervals matter and the literature supports them. For other Category II indications, multiple studies have found that decision-to-incision intervals greater than 30 minutes are not always associated with worse neonatal outcomes.

Plaintiffs should phrase the standard carefully: ACOG and AAP recommend that hospitals be capable of initiating cesarean delivery within 30 minutes of the decision, and current guidance recommends that decision-to-delivery for an indicated Category II or III tracing should ideally occur within 30 minutes. That is the accurate, defensible framing.

Hypoxic ischemic encephalopathy (HIE) is the brain injury that follows oxygen deprivation around the time of birth. Severe HIE leads to cerebral palsy, intellectual disability, and a lifetime of need.

The diagnosis is usually built from several pieces: an acute, sentinel intrapartum event (uterine rupture, placental abruption, cord prolapse, sustained bradycardia); a Category III or rapidly deteriorating Category II strip preceding delivery; a low umbilical artery cord pH at delivery (typically below 7.0) with a base deficit greater than 12; depressed Apgar scores at 5 and 10 minutes; need for resuscitation at birth; and MRI findings consistent with hypoxic-ischemic injury in the days following delivery.

If a child meets these criteria and the strip shows a clear deterioration that was not acted on, the case for preventability is strong. Therapeutic hypothermia within six hours of birth can reduce the severity of HIE; failure to initiate cooling for an eligible infant is its own potential standard-of-care violation.

Birth injury verdicts and settlements are among the largest in civil law because the damages model has to fund decades of care. A child born with severe HIE-induced cerebral palsy may need lifetime nursing care, multiple surgeries, communication and mobility equipment, special education, and lost-earning-capacity compensation. The American Academy of Pediatrics estimates lifetime care costs for severe cerebral palsy at well over $1 million in present dollars; for children requiring full-time skilled nursing, figures of $5 million to $20 million are not unusual.

These cases also have unusually long limitations windows because of minor tolling. In Virginia, a child injured at birth has until age 20 to file. In DC, until age 21 in most circumstances. In Maryland, the tolling extends to age 11. The interaction of minor tolling with the relevant statute of repose is jurisdiction-specific and worth checking early.

The first step is to obtain the complete medical record, including the original fetal monitor strips, the labor and delivery flow sheets, nursing notes, anesthesia records, the operative report (if cesarean), and the neonatal resuscitation record. EFM strips that were on paper may have been digitized; ask specifically for the original tracings or the highest-resolution scanned version.

Peter Anderson has resolved birth injury cases including a $6.5 million matter in Washington, D.C. for preventable complications during labor and delivery. He reviews birth injury inquiries personally and will obtain records and strip review where the case warrants it.