What is chorioamnionitis?
Chorioamnionitis (also called intra-amniotic infection, or simply “chorio”) is a bacterial infection of the amniotic fluid, the membranes surrounding the baby, the placenta, or the baby itself before or during labor. It usually develops when bacteria from the vagina travel upward into the uterus, most often after the membranes rupture or during a long labor. Chorioamnionitis complicates roughly 2–5% of term deliveries and a far larger share of preterm ones, and it is dangerous in both directions: it can make the mother seriously ill, and it can infect or inflame the baby at the most vulnerable moment of life.
The reason chorio matters so much legally is that it is a watched-for condition. Maternal temperature, fetal heart rate, and labor progress are all monitored continuously in a hospital, meaning the warning signs of intra-amniotic infection are, or should be, in front of the care team as they develop.
What does “chorio baby” mean?
Parents often first hear the word from a NICU nurse: “she’s a chorio baby.” It means the baby was exposed to intra-amniotic infection before birth and is being managed accordingly, typically with a sepsis evaluation (blood tests and sometimes a lumbar puncture), monitoring, and often intravenous antibiotics while cultures are pending. A “chorio baby” is not automatically a sick baby; many exposed newborns never develop infection. But the label matters: it tells you the infection was recognized, and it should trigger a defined set of newborn precautions under American Academy of Pediatrics guidance. If your baby was called a chorio baby and later suffered sepsis, meningitis, or brain injury, the timeline of when the infection was recognized and treated deserves scrutiny.
What causes chorioamnionitis
- Prolonged rupture of membranes. The longer the interval between the water breaking and delivery, especially beyond 18–24 hours, the higher the risk of ascending infection.
- Preterm premature rupture of membranes (PPROM). Ruptured membranes weeks before term create a standing infection risk that requires structured surveillance.
- Prolonged labor and many digital cervical exams, each of which can carry bacteria upward.
- Untreated maternal infections: urinary tract infections, bacterial vaginosis, and untreated group B strep colonization. See our guide to maternal infections and birth injuries.
- Internal monitoring devices placed during labor, which modestly raise risk.
Signs and how it is diagnosed
ACOG’s criteria for suspected intra-amniotic infection are deliberately concrete, because the diagnosis is meant to be made, and acted on, during labor rather than confirmed afterward:
| Finding | Threshold that should raise suspicion |
|---|---|
| Maternal fever | 39.0°C (102.2°F) or higher once; or 38.0–38.9°C (100.4–102.0°F) sustained on repeat measurement |
| Fetal tachycardia | Baseline fetal heart rate above 160 beats per minute for 10 minutes or longer |
| Maternal white blood cell count | Above 15,000 per mm³ without corticosteroids |
| Amniotic fluid | Purulent (pus-like) fluid from the cervical opening |
Under ACOG’s framework, a documented fever of 39.0°C with no other clear source (or a lower fever plus any additional finding) is enough to treat as suspected infection. Waiting for confirmation is not the standard; treating on suspicion is.
The treatment standard
Once intra-amniotic infection is suspected, ACOG’s guidance is unambiguous on three points:
- Start intravenous antibiotics promptly (typically ampicillin plus gentamicin) during labor rather than after delivery. Intrapartum antibiotics substantially reduce newborn sepsis.
- Treat the fever with antipyretics; maternal fever itself stresses the fetus.
- Move toward delivery. Chorioamnionitis is not by itself a reason for an immediate cesarean, but it is a reason to make steady progress toward delivery and to intervene when the fetal heart tracing deteriorates; an infected, febrile environment lowers a baby’s reserve for tolerating labor.
After birth, the pediatric team must be told about the chorio diagnosis so the newborn gets a timely sepsis evaluation and, where indicated, antibiotics. Handoff failures (the delivery team knew, the nursery didn’t) appear again and again in these cases.
When was the first fever charted — and when did antibiotics actually start? In chorio cases, the gap between those two timestamps often tells the whole story. Our attorneys review labor and NICU records with medical experts at no cost.
Risks to the baby: sepsis and cerebral palsy
An infected intrauterine environment threatens a baby two ways. The first is direct infection: neonatal sepsis, pneumonia, and meningitis, which can cause death or permanent brain injury if antibiotics are delayed. The second is inflammatory: the fetal inflammatory response and the fever itself are associated with injury to the developing brain. A meta-analysis in JAMA found chorioamnionitis was associated with roughly a doubling of cerebral palsy risk in term infants, and the ACOG/AAP Neonatal Encephalopathy report recognizes intrauterine infection and fever as contributors to newborn brain injury. Chorio also reduces a baby’s tolerance for labor, so it frequently appears alongside hypoxic-ischemic encephalopathy (HIE) in cases where a deteriorating fetal heart tracing was watched too long.
Was it preventable?
Not every case of chorioamnionitis is malpractice. Infection can develop despite proper care, particularly with preterm rupture of membranes. The legal questions concern the response rather than the infection itself: Was the fever recognized and repeated per protocol? Were antibiotics started during labor, when they protect the baby, or after delivery, when the chance was gone? Was the fetal heart tracing acted on? Was the newborn team told, and did the sepsis evaluation happen on time? Each question has a timestamped answer in the chart.
Legal options for families
Chorioamnionitis claims typically allege delayed diagnosis (missed fever criteria), delayed intrapartum antibiotics, failure to deliver a distressed baby promptly, or failure to evaluate and treat the newborn — often several together. Compensation can cover lifelong care for sepsis-related or hypoxic brain injury; for context on how comparable brain-injury cases have been valued, see our HIE compensation guide. Filing deadlines vary by state and can be short for a parent’s own claim.
The alliance splits coverage by where the care happened: Banville Law attorneys are licensed in New York and Washington, D.C.; The Weitz Firm attorneys are licensed in Pennsylvania and New Jersey (New Jersey families can start with our New Jersey birth injury guide). Outside those states, the alliance connects families with its vetted network of local birth injury attorneys.
Frequently asked questions
Is chorioamnionitis my fault?
No. Chorio develops from ordinary bacteria ascending into the uterus, usually after membranes rupture. Nothing a mother does in labor causes it, and the monitoring the hospital was already doing is what should have caught it.
My baby was a “chorio baby” but seems fine. Should I worry?
Most exposed babies who receive timely evaluation and antibiotics do well. If your child later shows developmental delays, seizures, or a cerebral palsy diagnosis, mention the chorio history to your pediatrician, and know that the birth records can be reviewed at any time.
Does chorioamnionitis cause cerebral palsy?
It raises the risk. Published research associates intrauterine infection and maternal fever with roughly a doubling of cerebral palsy risk in term babies, through both direct infection and inflammation of the developing brain. Whether it caused a particular child’s CP requires expert review of the records.
The hospital gave antibiotics after my baby was born. Wasn’t that enough?
Not necessarily. The standard is to start intravenous antibiotics during labor, once infection is suspected; intrapartum treatment is what reduces newborn sepsis. Antibiotics that started only after delivery may have come too late, and the timing is documented.
What does a case review cost?
Nothing. The review is free, and chorio cases are handled on contingency, meaning attorney fees come out of a recovery only, never your pocket.
Sources
- American College of Obstetricians and Gynecologists. Committee Opinion No. 712: Intrapartum Management of Intraamniotic Infection. Obstetrics & Gynecology. 2017;130(2):e95–e101.
- Higgins RD, Saade G, Polin RA, et al. Evaluation and Management of Women and Newborns With a Maternal Diagnosis of Chorioamnionitis: Summary of a Workshop. Obstetrics & Gynecology. 2016;127(3):426–436.
- Wu YW, Colford JM Jr. Chorioamnionitis as a risk factor for cerebral palsy: a meta-analysis. JAMA. 2000;284(11):1417–1424.
- Tita ATN, Andrews WW. Diagnosis and management of clinical chorioamnionitis. Clinics in Perinatology. 2010;37(2):339–354.
- American College of Obstetricians and Gynecologists & American Academy of Pediatrics. Neonatal Encephalopathy and Neurologic Outcome, 2nd ed. 2014.
- Puopolo KM, Benitz WE, Zaoutis TE; AAP Committee on Fetus and Newborn. Management of Neonates Born at ≥35 0/7 Weeks’ Gestation With Suspected or Proven Early-Onset Bacterial Sepsis. Pediatrics. 2018;142(6):e20182894.
This page is for general education and is not medical advice. Medical facts above are drawn from the cited primary sources; legal statements reflect the reviewing attorneys’ professional experience. Always consult your child’s physician about medical concerns.