Labor and delivery is one of the most physiologically demanding events in a baby’s life. When something goes wrong (oxygen drops, the cord compresses, distress is missed), the consequences can last a lifetime. Many of these events are preventable when standards of care are followed.
When parents look back at the moments around their child’s birth and wonder if something went wrong, they’re asking a question that deserves a clear answer. Some cerebral palsy cases result from natural complications that no amount of medical skill could have prevented. Others result from errors that could have been avoided: missed signs of distress, delayed cesareans, mishandled deliveries. Knowing which kind of complication produced an injury matters both medically and legally.
This guide covers the perinatal complications most often linked to CP: what they are, how they cause brain injury, and what should have been done to prevent or respond to them. The goal is to give families enough understanding of the standard of care to know what questions to ask.
Some pregnancies and deliveries carry higher CP risk than others. Knowing the risk factors helps medical teams plan ahead (with extra monitoring, specialist consultations, and contingency plans), and helps families ask the right questions before, during, and after delivery.
Risk factors fall into three groups: maternal/pregnancy factors that make complications more likely, infant factors that make any complication more severe, and care factors that determine how well the team responds when something does go wrong. Most birth-related CP cases involve some combination of all three.
The impact of premature birth on cerebral palsy
Premature birth is the single biggest risk factor, and the reason is structural: a preterm brain is unfinished, the lungs are immature, and the blood vessels around the ventricles are fragile. The risk scales steeply with how early the birth is.
A meta-analysis pooling 49 population-based studies put overall cerebral palsy prevalence at 2.11 per 1,000 live births, and prevalence among children born before 28 weeks at 111.80 per 1,000, roughly fifty times higher. Birth weight tracks the same pattern, with prevalence peaking at 59.18 per 1,000 among infants weighing 1,000 to 1,499 grams. Between 28 and 32 weeks the risk stays substantially elevated, driven mostly by intraventricular hemorrhage and periventricular leukomalacia. From 33 to 36 weeks it falls without reaching the term baseline. And low birth weight adds risk on top of gestational age rather than merely reflecting it. One finding from that same analysis is worth sitting with: overall prevalence has stayed flat in recent decades even as survival among at-risk preterm infants has improved, which means neonatal medicine has been saving infants faster than it has been preventing the injury. Our page on premature birth and cerebral palsy covers that group in detail.
For a fuller breakdown of how prematurity contributes to CP and what specialized neonatal care can do, see our guide on cerebral palsy and premature birth.
How maternal infections increase risk
Infections during pregnancy (whether they cross the placenta or just trigger maternal inflammation) can raise CP risk significantly. Cytomegalovirus (CMV), rubella, toxoplasmosis, and certain bacterial infections are the most studied. The mechanism is mostly inflammatory: maternal immune activation produces signaling molecules that affect fetal brain development. For the deeper picture, see cerebral palsy and maternal infections.
Prenatal complications that affect delivery
Some events labeled “birth complications” actually have prenatal roots. A baby who has been growth-restricted for weeks may not tolerate labor well; a placenta that’s been struggling may abrupt during contractions. Watching for these signs during pregnancy is part of preventing perinatal injury.
The complications that bridge prenatal and perinatal periods often determine how the delivery itself unfolds. Identifying them ahead of time lets the team make better decisions in the moment.
Fetal distress during pregnancy
Fetal distress describes a baby not getting enough oxygen or nutrients, and several signs should trigger evaluation rather than reassurance: reduced fetal movement reported by the mother, abnormal heart rate patterns on monitoring, decelerations on a non-stress test or biophysical profile, restricted growth on ultrasound, and reduced amniotic fluid.
The first of those is the one a mother reports and a chart can dismiss. It is worth being insistent about.
Persistent fetal distress can be addressed by repositioning the mother, increasing IV fluids, providing supplemental oxygen, or proceeding to delivery. Failure to recognize and respond to fetal distress is one of the most common claims in birth-injury malpractice cases.
The role of maternal health issues
Several maternal conditions raise the risk of perinatal complications, and most are identifiable well before labor.
Preeclampsia and chronic hypertension reduce placental blood flow and often force an early delivery, which introduces prematurity as a second risk on top of the first. Diabetes, whether pregestational or gestational, affects fetal growth and raises the odds of shoulder dystocia and a traumatic delivery. Untreated thyroid disorders affect neurodevelopment directly, since thyroid hormone drives fetal brain development. Obesity raises the risk of several complications including operative delivery. And substance use affects both placental function and how a newborn adapts in the first hours.
Most of these conditions can be managed safely with appropriate prenatal care. The risk goes up sharply when they go undetected or under-treated.
What continuous monitoring is supposed to catch
Electronic fetal monitoring tracks the baby’s heart rate against the mother’s contractions, and trained labor nurses are reading it for four specific patterns: late decelerations, which signal placental insufficiency; variable decelerations, which signal cord compression; loss of variability, which signals a compromised baby; and sustained tachycardia or bradycardia.
Those four patterns are what a medical record is later read for, because they establish what the team knew and when.
Perinatal events and cerebral palsy
The perinatal period (the last weeks of pregnancy through the first week of life) concentrates the most time-sensitive risks for CP. Many of these events have a narrow window for intervention, which is why prompt recognition and response matters more than almost anything else in this window.
The two perinatal categories most strongly linked to CP are oxygen deprivation events and traumatic delivery events. They produce different patterns of brain injury and call for different responses.
Labor and delivery complications
A short list of complications accounts for most perinatal brain injury.
Prolonged labor, particularly a long second stage, sustains pressure and stress that can compromise oxygen delivery. Breech, transverse and face presentations prolong labor or force an operative delivery. Shoulder dystocia, where the head delivers and the shoulders do not, can produce brachial plexus injury or oxygen deprivation if it goes on. Cord prolapse, where the cord drops ahead of the baby and is compressed, is a genuine emergency that requires immediate cesarean. Placental abruption separates the placenta from the uterine wall and cuts off oxygen supply outright. Uterine rupture is rare and catastrophic, and more likely during a trial of labor after a prior cesarean. And excessive force with forceps or a vacuum extractor can cause skull fracture, intracranial hemorrhage or brain swelling.
Each of these has an expected response. When the response is delayed or wrong, brain injury can result.
Understanding oxygen deprivation at birth
Birth asphyxia (severe oxygen deprivation around the time of birth) is one of the most consequential causes of CP. The clinical entity is called hypoxic-ischemic encephalopathy (HIE) when the deprivation is severe enough to produce identifiable brain dysfunction.
Hypoxic-ischemic encephalopathy declares itself in the first hours through low Apgar scores at five and ten minutes rather than at one, a need for resuscitation at delivery, seizures within hours of birth, abnormal tone that is usually very low, acidosis on cord blood gases, and MRI changes in the basal ganglia, thalamus or cortex.
That combination matters clinically as well as evidentially, because it is what qualifies an infant for therapeutic hypothermia. Pooled across 11 randomized trials of 1,505 term and late preterm infants with moderate or severe encephalopathy, cooling reduced death or major neurodevelopmental disability at 18 months with a relative risk of 0.75 and a number needed to treat of 7. It has to start within hours.
Therapeutic hypothermia, cooling the baby’s body temperature to about 33.5°C for 72 hours, has become standard care for moderate to severe HIE when started within 6 hours of birth. It significantly improves neurological outcomes and reduces CP severity. Failure to identify HIE in time to start cooling is a common malpractice claim. For the dedicated guide, see cerebral palsy and lack of oxygen at birth.
Common signs of preventable birth injury
If your delivery records show any of these, a malpractice review may be warranted: prolonged second-stage labor without intervention; delayed cesarean despite signs of fetal distress; APGAR scores under 7 at five minutes; resuscitation needed at birth; HIE diagnosis without prompt cooling. Our birth injury lawyers offer free record reviews. Request a free case review.
Postnatal complications that contribute to cerebral palsy
About 10–15% of CP cases are acquired after birth, from infections, head injuries, or other events in the first weeks or months of life. Many of these are preventable with prompt newborn care.
The postnatal causes of CP are sometimes overlooked because attention focuses so heavily on labor and delivery. But events in the first weeks (especially in the NICU or after early discharge) can produce serious brain injury.
Identifying neonatal infections
Several newborn infections can produce cerebral palsy when treatment is delayed.
Bacterial meningitis in newborns is usually group B streptococcus, E. coli or Listeria, diagnosed by lumbar puncture and treated aggressively with intravenous antibiotics. Sepsis produces widespread inflammation and brain injury, and early recognition is the whole game. Encephalitis is often viral, with herpes simplex being the dangerous one in this age group. And severe pneumonia can produce enough hypoxia to injure the brain even though the lungs are the organ in trouble.
Early signs of newborn infection (temperature instability, poor feeding, lethargy, breathing difficulty, irritability) should always trigger immediate evaluation. Failure to recognize early sepsis is a recognized cause of preventable CP.
The role of birth asphyxia in postnatal injury
Birth asphyxia doesn’t always produce immediately obvious damage. Sometimes a baby seems to do well in the first hours but develops seizures, abnormal tone, or feeding difficulties days later. The brain injury that produces CP can evolve over the first 72 hours after a hypoxic event, one of the reasons careful monitoring continues well after birth in any baby with a difficult delivery.
A few postnatal causes belong on the list even though they fall outside the delivery itself.
Untreated high bilirubin damages the basal ganglia selectively, producing dyskinetic cerebral palsy, and routine screening with phototherapy prevents it almost entirely, which is what makes a missed case so hard to defend. Stroke can occur in the days to months after birth, from either blockage or hemorrhage. Head injury from a fall, an accident or abuse in the first two years produces injury that meets the definition. And severe respiratory failure can starve the brain of oxygen in an older infant just as it can in a newborn.
Were you told everything was fine when it wasn’t?
Many families learn years later that their delivery records tell a different story than what they were told at the time. Our nurse advocates can help you read your records and identify any concerns worth investigating further. Get a free, confidential evaluation.
Why early diagnosis matters
Whatever caused your child’s CP, getting a confirmed diagnosis as early as possible opens the door to early-intervention services that genuinely change long-term outcomes. The brain’s plasticity is greatest in the first 3 years, when therapy can do the most good. Don’t wait for definitive answers about cause to start therapy. See our guide on how cerebral palsy is diagnosed for the full process.
Frequently asked questions about birth complications and CP
Prematurity above all: prevalence runs at 111.80 per 1,000 live births among children born before 28 weeks, against 2.11 per 1,000 overall. After that come placental abruption, cord prolapse, prolonged labor, shoulder dystocia, uterine rupture, abnormal presentation, excessive force with forceps or vacuum, untreated newborn infection and untreated severe jaundice.
Through specific failures rather than through bad outcomes generally. Failing to act on fetal heart rate patterns that signal distress, delaying a cesarean once the indication is clear, misusing forceps or a vacuum extractor, missing a newborn infection, or leaving severe jaundice untreated when screening and phototherapy would have prevented it. What separates a claim from a tragedy is usually the record: what the monitoring strip showed, when it showed it, and what the team did next. A birth injury lawyer reviews delivery records to establish that sequence.
Because the first three years are when the brain rewires most readily, so therapy started then produces gains that identical therapy at six does not fully replicate. Early diagnosis also opens Part C early-intervention services, which are federally funded regardless of family income, and it starts the surveillance that catches hip displacement and feeding problems while they are still small.
As soon as something looks off, without waiting for a milestone deadline to pass. Stiffness or floppiness, a strong hand preference before 12 months, difficulty coordinating suck, swallow and breathing, newborn reflexes that fail to fade, or missed motor milestones all warrant an evaluation. Standardized tools such as the General Movements Assessment can identify risk in the first months, well before a formal diagnosis is usually given.
Early intervention under Part C of IDEA covers children under three regardless of income, and school-based services continue under Part B. Medicaid waiver programs in most states cover equipment and attendant care that private insurance denies, and eligibility for those is often based on the child rather than the household. Supplemental Security Income may apply. Where a birth injury is involved, a medical malpractice claim can fund the equipment, therapy and attendant care that nothing else covers, and most birth injury lawyers work on contingency, so there is no upfront cost to find out whether a case exists.
It is the strongest single risk factor. A preterm brain is unfinished and the blood vessels near the ventricles are fragile, which is why intraventricular hemorrhage and periventricular leukomalacia cluster in this group and produce the spastic diplegia pattern that affects the legs more than the arms. Overall cerebral palsy prevalence has stayed flat across recent decades even as survival among at-risk preterm infants improved, which tells you neonatal care has been better at saving these infants than at preventing the injury.
It depends on which part of the brain was injured. Oxygen deprivation at term tends to damage the basal ganglia and produce dyskinetic cerebral palsy with involuntary movements. The preterm pattern damages white matter near the ventricles and produces spastic diplegia. Untreated jaundice damages the basal ganglia selectively. Early signs in any of them include abnormal tone in either direction, feeding difficulty, delayed motor milestones and asymmetry in how a baby moves, all covered on our page about cerebral palsy symptoms.
