Shoulder Dystocia and Erb's Palsy: What Parents of a Child With a Brachial Plexus Injury Should Know

Most of the time a baby's head and shoulders deliver in a smooth sequence. Shoulder dystocia is the moment that sequence stops. The head delivers, but the baby's anterior shoulder, the one at the top, catches behind the mother's pubic bone and will not pass with normal gentle traction. Less often the posterior shoulder hangs up on the sacral promontory at the back of the pelvis. The classic warning sign is the turtle sign: the head emerges and then retracts tight against the perineum, like a turtle pulling back into its shell.

It is an emergency because the moment the shoulder is stuck the umbilical cord is often compressed and the baby's oxygen supply starts to fall. The delivery team has minutes, not longer, to free the shoulder before oxygen deprivation threatens the brain. That time pressure is why hospitals drill for shoulder dystocia the way they drill for cardiac arrest, and why what the team does in those minutes becomes the center of any later review.

Shoulder dystocia is not common, but it is not rare either. The American College of Obstetricians and Gynecologists, in its Practice Bulletin No. 178 on shoulder dystocia, describes it as complicating up to about 1.4 percent of vaginal births. The risk rises steeply with the baby's size. The American Family Physician review by Baxley and Gobbo reported shoulder dystocia in roughly 0.6 to 1.4 percent of babies weighing 2,500 to 4,000 grams, climbing to 5 to 9 percent among babies of 4,000 to 4,500 grams born to mothers without diabetes.

There is a well-established, teachable response to shoulder dystocia, and most delivery teams learn it as a sequence. A common memory aid taught in obstetric emergency courses is the mnemonic HELPERR. H is for call for help, bringing additional staff and equipment to the room. E is for evaluate the need for an episiotomy, which by itself does not free a bony impaction but can make room for the hand maneuvers. L is for legs, the McRoberts maneuver. P is for suprapubic pressure. E is for enter maneuvers, meaning internal rotation of the baby's shoulders. R is for remove the posterior arm. The final R is for roll the patient onto all fours, known as the Gaskin maneuver.

The McRoberts maneuver is usually first because it is simple and it works. The mother's legs are flexed back sharply onto her abdomen, which flattens the lower spine and rotates the pubic bone up and away from the trapped shoulder. Baxley and Gobbo reported that McRoberts alone relieves more than 40 percent of shoulder dystocias, and combined with suprapubic pressure it resolves more than half. Suprapubic pressure means an assistant presses down and to the side on the baby's stuck shoulder from above the mother's pubic bone, nudging it under the arch. If those do not work the team moves to rotating the baby internally and delivering the posterior arm. The Zavanelli maneuver, pushing the head back in for an emergency cesarean, is a last resort tied to serious risk.

Two points from the guidelines matter for families trying to understand a delivery after the fact. First, the exact order of maneuvers is less important than doing each one promptly and well, without getting stuck repeating a single move that is not working. Second, there is one thing the team is specifically trained not to do: fundal pressure, meaning pushing down on the top of the uterus to force the baby out. Baxley and Gobbo state plainly that fundal pressure is never appropriate and only worsens the impaction, and ACOG's brachial plexus task force reported that fundal pressure during a recognized shoulder dystocia can make the impaction worse and increase the risk of nerve injury. ACOG also recommends that labor units run shoulder dystocia drills and protocols, because a coordinated team response is something that has to be practiced.

The brachial plexus is the bundle of nerves that runs from the spinal cord in the neck, through the shoulder, and down each arm. It carries every signal that moves the shoulder, arm, and hand. When a shoulder is stuck and force is transmitted across the baby's neck and shoulder, those nerves can be stretched, and in severe cases torn or pulled from the spinal cord. The injury that follows is called neonatal brachial plexus palsy.

Erb's palsy is the most common form. It involves the upper nerve roots, C5 and C6, and leaves the affected arm hanging limp and turned inward, a position clinicians call the waiter's tip. Klumpke's palsy is less common and involves the lower roots, C8 and T1, affecting the hand and wrist. ACOG's Task Force on Neonatal Brachial Plexus Palsy reported an overall rate of about 1.5 cases per 1,000 births, with Erb's palsy accounting for roughly 1.2 per 1,000 and Klumpke's palsy for about 0.05 per 1,000.

The reassuring part is that most of these injuries heal. Nerve stretch without a tear tends to recover as the nerve regenerates. Baxley and Gobbo reported that nearly all brachial plexus palsies resolve within 6 to 12 months, with fewer than 10 percent leaving a permanent injury. ACOG's task force put complete recovery in the range of 50 to 80 percent and reported that the share of cases still present at 12 months ranges from 3 to 33 percent across different studies. A child whose arm is working normally within the first year is the common story. The cases that end up in a lawyer's office are the ones where the arm does not recover, where a child faces a lifetime of limited movement, repeated surgeries such as nerve grafting or tendon transfers, and years of therapy.

This is where brachial plexus cases are won and lost, and families deserve a straight account of it. For a long time the argument made on behalf of injured children was simple: a permanent brachial plexus injury only happens when the delivering clinician pulls too hard on the baby's head, applying excessive lateral traction. If the nerve was torn, the reasoning went, someone must have pulled too hard.

The medical societies have complicated that picture, and any honest article has to say so. ACOG's Task Force on Neonatal Brachial Plexus Palsy, in its 2014 report, concluded that the injury can occur without a clinically recognizable shoulder dystocia at all, that all of the ancillary delivery maneuvers necessarily put some strain on the brachial plexus no matter how skillfully they are performed, and that the mere existence of the injury after birth does not prove that outside force was its sole cause. The task force reported that in a review of the literature, about 46 percent of brachial plexus injuries occurred without a documented shoulder dystocia, and that the injury is sometimes seen even after cesarean delivery, at a rate of roughly 0.3 to 1.5 per 1,000 cesarean births. It also pointed to the natural propulsive forces of labor, which can push the baby's body down while a shoulder is held up, stretching the nerves without anyone pulling. The report warned against what it called an erroneous retrospective inference of causation, meaning the assumption that because an injury happened, the delivery must have been done wrong.

None of that gives every delivery a free pass, and it is important not to read it that way. ACOG's own report identifies fundal pressure during a recognized shoulder dystocia as a practice that can worsen the impaction and increase the risk of injury. Excessive traction remains a recognized cause of these injuries, not a myth. What the report really establishes is that a bad outcome by itself does not prove negligence, and that the real question in any individual case is what the record shows about how that specific delivery was handled. That is not a reason to assume the worst, and it is not a reason to assume nothing went wrong. It is a reason these cases cannot be judged from the diagnosis alone. They turn on a careful reading of the delivery record by people who do this for a living, which is one reason brachial plexus cases following shoulder dystocia have long been one of the largest categories of obstetric litigation.

One of the cruelest features of birth injury law is that the clock starts at or near birth, long before most families know whether their child's arm will recover. Many states give extra time for injuries to children through what are called minor tolling rules, but those rules vary widely and they are not as generous as parents often assume. In Virginia a child injured at birth generally has until age 20 to bring a claim. In the District of Columbia the window commonly runs until about age 21. In Maryland the tolling is much shorter, extending only to roughly age 11. These rules also interact with a separate deadline called the statute of repose, and the combination is specific to each state and each set of facts.

Waiting is the expensive mistake. It is natural to want to see first whether therapy will bring the arm back, and no one should rush a family through that. But evidence does not wait. Witnesses move and forget, records are archived, and the detailed recollections that make or break these cases fade. The safe path is to let a lawyer preserve the record now, quietly, while you focus on your child's treatment. If the arm recovers, you have lost nothing. If it does not, you have protected your child's ability to recover the cost of a lifetime of care. Our article on the statute of limitations for medical malpractice walks through how these deadlines work and why the start date matters so much. The short version is that the clock is already running, and it is far cheaper to ask early than to find out too late that it has stopped.

Start by gathering the complete record of the labor and delivery. That means the delivery note and any shoulder dystocia documentation form, the labor and delivery flow sheets and nursing notes, the fetal monitor strips, the cord blood gas results, the newborn resuscitation record, the Apgar scores, and the pediatric and neurology records that followed. If you were told your baby's shoulder was stuck, or heard the words shoulder dystocia or Erb's palsy, write down what you remember being said in the room and when, while it is fresh.

A records review costs nothing and commits you to nothing. The point of it is not to assume a mistake was made. As the medical societies make clear, many brachial plexus injuries happen despite careful management, and an honest review may well tell you that your child's delivery was handled correctly. The point is to find out, from the record, whether what happened falls within the range of a reasonable response to an emergency or outside it. Either answer is worth having.

Peter Anderson reviews birth injury inquiries personally and has resolved birth injury cases including a $6.5 million matter in Washington, D.C. for preventable complications during labor and delivery. We handle these cases with the long time horizon they require, including the lifetime-care damages model that birth injury recoveries have to fund, and we review matters nationwide, with a particular footprint across Virginia, D.C., and Maryland. If your child was born with Erb's palsy or another brachial plexus injury, the free and confidential review is a way to find out where you stand while the answer can still help.