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Erb's palsy
risk factors

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
Provider role
Skilled obstetric technique substantially reduces risk

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.

Common risk factors for Erb's palsy

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

Labor complications and brachial plexus injury

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.

Obstetric team reviewing delivery monitors during labor while assessing Erb's palsy risk factors

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

Perinatal care strategies

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

Vaginal birth complications

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

Maternal diabetes and neonatal nerve damage

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.