Erb’s palsy risk factors fall into two camps — birth mechanics (shoulder dystocia, macrosomia, delivery technique) and maternal health (gestational diabetes, preeclampsia). Understanding both is the first step toward prevention.
Medically reviewed
Updated May 2026
~ min read
Shoulder dystocia
The most significant single risk factor for Erb’s palsy
Modifiable
Many risk factors can be managed with prenatal care
Erb’s palsy risk factors are a significant concern for expectant parents and healthcare providers. The condition results from injury to the brachial plexus — a nerve network near the neck controlling arm muscles — that can occur during childbirth. These risk factors range from specific birth complications to broader medical and genetic influences. Identifying and managing them can substantially reduce the chances of Erb’s palsy and minimize long-term effects.
This page covers the major risk factor categories, how delivery method matters, and the role of maternal health. For the broader picture, see Erb’s palsy overview.
Many factors relate to the mechanics of childbirth — shoulder dystocia, prolonged labor, and the use of excessive force. Recognizing these risk factors allows healthcare providers to take proactive steps to prevent the condition.
Understanding shoulder dystocia
Baby’s shoulder becomes lodged behind the mother’s pubic symphysis
Excessive pressure on the infant’s brachial plexus nerves
Excessive force during delivery — manual or with forceps
Nerve stretching or tearing in the brachial plexus
Skilled delivery technique reduces risk
Prevention of Erb's palsy
Prevention requires a strategic approach to managing labor and delivery. Addressing complications proactively reduces neonatal nerve damage — including avoiding medical negligence when providers fail to recognize or respond to potential complications.
Layers of prevention
Risk management spans the whole journey:
Prenatal monitoring of fetal growth and position
Maternal health management (diabetes, hypertension)
Anticipating shoulder dystocia risk
Trained team and rehearsed maneuvers
Timely decisions about delivery method
Effective obstetric risk management
Anticipate potential complications
Comprehensive provider training on shoulder dystocia
Established protocols and best-practice adherence
Helps prevent medical negligence in delivery
Perinatal care strategies
Optimal maternal nutrition and regular check-ups
Careful monitoring of fetal growth and positioning
Anticipating issues like shoulder dystocia
Safer deliveries and lower Erb’s palsy incidence
Erb's palsy and delivery methods
Delivery method significantly impacts risk. Cesarean sections are often considered when shoulder dystocia risk is high, but they come with their own considerations. Vaginal birth complications — especially when delivery tools are used — also contribute to risk.
Impact of cesarean sections
Reduces risk of difficult vaginal delivery
Comes with maternal recovery considerations
Balance between traumatic delivery vs. surgical recovery
Decision driven by individual risk profile
Vaginal birth complications
Vacuum extractors or forceps can apply excess force
Skilled handling and timing reduce risk
Recognition of escalating complications matters
Provider judgment is critical in the moment
Impact of maternal health on Erb's palsy
Maternal health plays a critical role. Conditions like preeclampsia and maternal diabetes can increase the likelihood of birth injuries. Understanding these helps implement strategies that promote healthier outcomes for mothers and babies.
Role of preeclampsia in birth injuries
High blood pressure during pregnancy
Reduced blood flow to the placenta
Affects fetal growth and labor complications
Early intervention with monitoring and timely delivery planning
Maternal diabetes and neonatal nerve damage
Can lead to macrosomia (larger-than-average baby)
Increases shoulder dystocia risk
Effective management through diet, exercise, and medication
Glucose control significantly reduces baby’s growth-related risk
When risk factors are mismanaged
When providers fail to identify or respond to known risk factors and a child develops Erb’s palsy, families may have a legal claim. Specialized birth injury lawyers can review your case at no cost.
Frequently asked questions about Erb's palsy risk factors
Primary risk factors include shoulder dystocia and macrosomia (a larger-than-average baby). These conditions increase the likelihood of a difficult delivery, which may lead to nerve injuries.
Yes — though less common than after vaginal deliveries. Erb’s palsy can occur if there’s significant difficulty in delivering the baby during a C-section.
Monitor for risk factors like fetal macrosomia and shoulder dystocia during pregnancy. Appropriate delivery techniques and timely interventions minimize the risk — see prevention strategies.
Shoulder dystocia occurs when a baby’s shoulder gets stuck behind the mother’s pelvic bone — creating tension in the neck and shoulder area that can stretch or injure the nerves.
Yes — technique influences risk. Proper handling and maneuvers avoid excessive pressure on the baby’s neck and shoulders, reducing the risk of nerve damage.
Some risk factors like natural fetal size and positioning are unavoidable. Awareness and management during pregnancy and delivery help minimize risks.