A parent’s guide to understanding, diagnosing, and treating brachial plexus birth injury — nerve damage to the network supplying the shoulder, arm, and hand. With early detection and the right treatment, many children recover full or near-full arm function.
Medically reviewed
Updated April 2026
~ min read
10–20 per 10K
U.S. births result in a brachial plexus birth injury
4–9 months
Optimal surgical window for severe injuries that don’t respond to therapy
3× higher
Risk of brachial plexus injury when shoulder dystocia is present
What is a brachial plexus birth injury?
A brachial plexus birth injury refers to damage to the bundle of nerves that originate in the neck (spinal nerve roots C5 through T1) and travel through the shoulder to the arm and hand. These nerves control both the movement and feeling of the upper limb.
During birth, if the baby’s head and neck are stretched too far away from the shoulder, or the shoulder becomes stuck behind the mother’s pelvic bone (shoulder dystocia), these nerves can be stretched, torn, or in the most extreme cases pulled from the spinal cord entirely.
Depending on the severity, the baby may have partial weakness, loss of motion, or complete paralysis of the affected arm. Some babies recover fully with minimal intervention; others may need surgery and ongoing therapy. The condition may also be referred to as “obstetric brachial plexus paresis,” “Erb’s palsy” (for upper-nerve root injuries), or brachial plexus birth palsy.
The severity and treatment path for brachial plexus birth injury depends entirely on the type of nerve damage. There are four types, ranging from temporary nerve stretching to permanent avulsion from the spinal cord.
Mildest
Neuropraxia — nerve stretching
The nerve is stretched but not torn. The most common type. Most infants recover full movement within three months with physical therapy alone — no surgery required. Often produces a temporary burning or tingling sensation.
Moderate
Neuroma — scar tissue forms
The nerve tears slightly and heals improperly, forming scar tissue that compresses healthy surrounding nerves. Causes partial function loss. May recover some movement with therapy but often requires surgical intervention for full restoration.
Severe
Rupture — nerve completely torn
The nerve is completely torn but not at the spinal root. Does not heal on its own. Requires nerve grafting surgery — a healthy nerve from another part of the body is used to bridge the torn ends. Surgery should occur within 4 to 9 months for best results.
Most Severe
Avulsion — nerve torn from spinal cord
The nerve is ripped away from the spinal cord entirely — permanent damage that cannot be repaired by reattachment. Surgery may reroute nearby functioning nerves to compensate. Can also cause Horner’s syndrome (drooping eyelid, small pupil) when sympathetic fibers near T1 are affected.
How is brachial plexus injury diagnosed?
Diagnosis begins with a thorough clinical examination by a pediatrician, pediatric neurologist, or upper-extremity specialist. The first step is identifying signs such as a limp arm, minimal movement, or absent normal reflexes on the affected side.
The doctor assesses whether the baby’s shoulder, elbow, wrist, and hand move normally and whether the baby can grasp or respond to touch on the affected side. If symptoms persist beyond the early weeks, further diagnostic tests are used:
MRI or CT myelography — visualizes nerve roots, plexus anatomy, and related soft-tissue injury; helps identify the level and extent of damage
Nerve conduction studies (EMG) — evaluates how well nerves conduct signals and which muscles are being affected; helps distinguish neuropraxia from rupture or avulsion
X-rays — excludes associated fractures such as clavicle or humerus fractures that may accompany a difficult birth
Early assessment is important because timely interventions — especially when surgery may be needed — are closely linked to better long-term outcomes.
At what age can brachial plexus injury be diagnosed?
A suspected brachial plexus birth injury can be identified immediately after birth if a baby shows limited or absent motion in one arm, lacks normal reflexes, or has clear signs of nerve dysfunction. However, more definitive diagnosis and treatment planning typically occur in the first weeks to months of life.
Pediatricians recommend close monitoring during the first 3 to 6 months to track whether spontaneous recovery is underway. If there is little or no improvement by 3 to 6 months, further specialist evaluation or surgical consultation is generally advised. In some milder cases the injury may go unnoticed until later — when the child begins to reach for toys, crawl, or walk — and reveals weakness or limited arm motion compared to peers.
Early involvement of therapy and specialists is beneficial even when a full diagnosis is still being refined. Don’t wait for a definitive answer before beginning therapy; early range-of-motion work is important regardless of injury type.
The 3-month rule
If your baby’s affected arm is not showing clear improvement by 3 months of age, ask your pediatrician for an immediate referral to a pediatric neurologist or upper-extremity surgeon. The surgical window closes — acting by 4 to 9 months significantly improves outcomes.
Symptoms of brachial plexus injury in infants
Symptoms vary depending on which nerve roots are affected and how severely. The injury may affect the upper roots (C5–C6), lower roots (C8–T1), or the entire plexus, producing different patterns of weakness and sensation loss.
Typical warning signs in a newborn include:
A baby who doesn’t move one arm or uses it significantly less than the other
The arm held limp at the side, often with the elbow extended and wrist rotated inward (“waiter’s tip” position in upper-root injuries)
Absent or weak reflexes on the affected side (e.g., biceps reflex, Moro reflex)
Grasp reflex may be intact, but wrist or finger motion is limited
Reduced muscle tone in the affected limb
Failure to reach motor milestones in the affected arm as the baby develops
In older infants, signs may include weaker grip, poor coordination, muscle atrophy, shoulder joint deformity, or persistent muscle tightening. Because nerves regenerate slowly, signs may change over time — some children improve while others develop joint stiffness from secondary contracture. Raise concerns with your pediatrician if the affected arm is not improving by 3 months or if the shoulder appears stiff.
What causes brachial plexus injury in babies?
The most common cause is shoulder dystocia — when the baby’s shoulder becomes stuck behind the mother’s pubic bone after the head has delivered. The resulting traction on the head and neck stretches or tears the brachial plexus nerves.
Key risk factors
Shoulder dystocia — the single greatest risk factor; nearly triples the risk of brachial plexus injury
Large birth weight (macrosomia) — especially in mothers with diabetes or gestational diabetes
Prolonged or difficult labor — increases pressure on the baby’s neck and shoulder
Instrument-assisted delivery — forceps or vacuum use during shoulder dystocia significantly elevates risk
Breech or unusual fetal positioning — increases tension on the brachial plexus
Maternal obesity or gestational diabetes — associated with larger babies and more difficult deliveries
Can brachial plexus injury be caused by medical malpractice?
Yes — some brachial plexus birth injuries occur when the standard of obstetric care was not met. Not all cases are due to negligence, but expert review of birth records can determine whether preventable errors played a role.
Shoulder dystocia was mishandled or appropriate maneuvers were delayed
Excessive traction or force was applied despite recognized shoulder impaction
Known risk factors (fetal macrosomia, maternal diabetes) were not proactively managed or communicated
Instrument-assisted delivery was used improperly in a high-risk birth
A C-section was not offered or recommended when fetal size or pelvic factors warranted it
Determining whether malpractice occurred requires detailed review of medical records, fetal monitoring, labor and delivery notes, the timing of interventions, and expert opinion. If you suspect negligent care, our birth injury attorneys are available at no charge to review your case and advise you on your options.
A brachial plexus birth injury may overlap with or lead to associated conditions. Many are directly caused by the same nerve damage; others develop over time without early intervention.
Injury to the upper roots (C5–C6), causing shoulder and upper arm weakness. The most common form of brachial plexus birth injury — arm hangs limply in the classic “waiter’s tip” position.
Klumpke’s Palsy
Injury to the lower roots (C8–T1), affecting the forearm and hand. Can cause a “claw hand” deformity. Rarer than Erb’s palsy but often more difficult to treat.
Horner’s Syndrome
In severe avulsion injuries involving the T1 sympathetic root, signs include drooping eyelid, small pupil, and reduced facial sweating on the affected side. Indicates significant nerve root damage.
Contractures & Joint Deformity
Without timely therapy, stiffness in the shoulder, elbow, or wrist can develop and limit movement long-term. Passive range-of-motion exercises from early infancy are the primary prevention.
Developmental Asymmetry
Because babies may prefer the unaffected arm, delays in bimanual tasks or fine-motor skills can emerge. Occupational therapy addresses these developmental gaps alongside motor recovery.
Neuropathic Pain
In older children with incomplete recovery, nerve injuries may produce persistent discomfort or sensory deficits in the affected arm. Pain management becomes part of the longer-term care plan.
Is there a cure for brachial plexus birth injury?
There is no single cure that guarantees full recovery in every case, but many infants with less-severe injuries recover substantial or full function — particularly when treatment begins early. “Cure” is the wrong word; “recovery” better describes what modern treatment can achieve.
Mild injuries (nerve stretching/neuropraxia) often resolve on their own with physical therapy. In more severe cases such as nerve rupture or avulsion, a combination of therapy and timely surgery offers the best chance of meaningful improvement. Surgeries such as nerve repair, nerve grafting, or nerve transfers may restore function, but results typically take months to years to fully manifest — nerve growth is slow.
The earlier surgical intervention occurs — often within the first 3 to 9 months of life — the better the chances of success. After 18 months, muscles may atrophy and lose their ability to respond to reinnervation, significantly limiting the benefit. With modern therapy, surgery, and early intervention, good function is achievable for many children.
Treatment for brachial plexus birth injury
Treatment is tailored to the severity of nerve damage and the child’s response over the first months of life. It broadly falls into conservative therapy and surgical intervention, with the threshold for surgery typically reached at 3 to 6 months without adequate improvement.
Non-surgical treatment
For many infants, especially those with milder injuries, therapy begins early and can lead to full recovery:
Physical therapy and occupational therapy — maintain joint range of motion, prevent stiffness and contracture, and encourage use of the affected arm; parents learn home exercises to use daily
Splinting or bracing — holds the arm, wrist, or hand in proper position to prevent deformity
Passive and active range-of-motion exercises — starting as early as 3 weeks of age to keep the shoulder, elbow, wrist, and fingers mobile
Close monitoring — regular assessment ensures therapy is adjusted and surgical referral is made promptly if progress stalls
Surgical treatment
If there is minimal or no improvement by 3 to 6 months, surgical options are considered. Timing is critical — most centers suggest surgery between 4 and 9 months offers the greatest chance of recovery:
Nerve repair or grafting — direct repair of damaged nerves, or grafting nerve tissue from another part of the body to bridge the gap
Nerve transfer — connecting a functioning donor nerve to the injured nerve to reanimate the muscle; used in more severe rupture or avulsion injuries
Tendon or muscle transfer — in older infants with established secondary problems, surgeons may move tendons or muscles to improve function or alignment
Osteotomy — repositioning bones to correct joint deformity caused by muscle imbalance from nerve damage
Long-term follow-up
Recovery takes time. Nerve growth is slow, and full results of surgery may only be apparent over years. Even with good recovery, children may need ongoing therapy, monitoring of shoulder development, and adjustments as the limbs grow. Parents play a foundational role — ensuring therapy is consistent, watching for signs of contracture, and advocating with specialists when progress stalls.
A brachial plexus birth injury can be a frightening diagnosis for families — especially when an arm seems limp, unused, or your baby appears to favor one side. But there is a lot to be hopeful about. With early observation, appropriate therapy, and timely surgical intervention when needed, many children regain full or near-full use of their arm.
The key is early detection, proactive management, and a coordinated care team including a pediatric neurologist or upper-extremity surgeon, physical and occupational therapists, and you as your child’s most important advocate.
If your child’s delivery was difficult, birth weight high, or there were signs of shoulder dystocia — and you notice limited movement in one arm — raise the issue with your pediatrician as soon as possible. Ask for a referral to a specialist, request clear timelines for improvement, and keep careful records of therapy and movement progress. Don’t wait beyond the typical window of improvement. Timely action matters.
Was your child’s injury preventable?
If you believe medical mistakes contributed to your child’s brachial plexus injury, contact us today for a free, confidential review with a nurse or lawyer.
Frequently asked questions about brachial plexus birth injury
A brachial plexus birth injury is damage to the bundle of nerves that runs from the neck through the shoulder to the arm and hand. During birth, if the baby’s neck is stretched too far from the shoulder, or the shoulder becomes stuck during delivery (shoulder dystocia), these nerves can be stretched, torn, or pulled from the spinal cord, leaving the baby with weakness or paralysis in the affected arm.
Brachial plexus birth injury affects approximately 10 to 20 per 10,000 births in the United States. It is one of the more common birth-related nerve injuries seen in neonatal units and pediatric rehabilitation clinics, though rates have been declining with improved obstetric practices around managing shoulder dystocia.
Yes — many children with mild brachial plexus injuries (neuropraxia) recover full or near-full function with physical therapy alone within three months. However, more severe injuries such as nerve ruptures or avulsions do not heal on their own and require surgical repair. The critical factor is monitoring closely and acting surgically within the 4–9 month window if therapy is not producing sufficient improvement.
Erb’s palsy is a specific type of brachial plexus birth injury affecting the upper nerve roots C5 and C6, primarily causing weakness in the shoulder and upper arm. Brachial plexus injury is the broader category covering damage anywhere along the C5–T1 nerve roots. Klumpke’s palsy, which affects the lower roots C8–T1, is another form of brachial plexus injury causing hand and forearm weakness.
Surgery is generally considered when a child shows minimal or no improvement in arm movement by 3 to 6 months of age despite consistent therapy. Most specialist centers recommend performing surgery between 4 and 9 months of age for the best outcomes. After 18 months, muscle atrophy and reduced nerve responsiveness significantly limit the benefit of surgical intervention.
Yes, in some cases. When shoulder dystocia is mismanaged, excessive force is applied, known risk factors were ignored, or instruments were used inappropriately, the resulting injury may constitute medical negligence. Not every case is preventable, but expert review of birth records can determine whether substandard care contributed to the injury. Contact our team for a free review.
