Shoulder Dystocia

Shoulder dystocia is an unexpected and urgent situation during vaginal childbirth when a baby's head delivers, but one of their shoulders gets stuck behind the mother's pubic bone. It is a medical emergency that requires quick action from the healthcare team to safely deliver the baby and prevent potential complications for both the baby and the mother.

What is Shoulder Dystocia?

Shoulder dystocia is an unpredictable and urgent complication during vaginal birth where, after the baby's head has emerged, one of their shoulders becomes trapped behind the mother's pubic bone. This obstetric emergency requires immediate and skilled intervention from the medical team to help free the baby and prevent serious harm to both the baby and the mother.

This condition is relatively uncommon, occurring in about 2 to 3 out of every 100 vaginal births (0.2% to 3%). When shoulder dystocia happens, the baby's head may appear to retract slightly back towards the mother's body, a sign sometimes called the "turtle sign." This indicates that the shoulder is stuck and cannot pass through the birth canal easily. The medical team must act quickly and calmly to resolve shoulder dystocia. They use specific maneuvers, which are special movements or positions, to help dislodge the baby's shoulder. The goal is to deliver the baby as safely and quickly as possible to reduce the risk of injury to the baby and the mother.

Symptoms

You will not experience any symptoms of shoulder dystocia before labor begins. The condition is identified during the second stage of labor, specifically after your baby's head has been delivered. The main sign is when your baby's shoulders do not follow the head out of the birth canal with normal pushing efforts, often accompanied by the baby's head pulling back slightly.

The key indicator of shoulder dystocia is a visual one for the healthcare provider. After the baby's head emerges from the vagina, it may appear to pull back tightly against the mother's perineum (the area between the vagina and anus). This is known as the "turtle sign" because it resembles a turtle pulling its head back into its shell. Following the "turtle sign," the baby's shoulders will not spontaneously deliver, even with further contractions or the mother's pushing. This signals to the medical team that the baby's shoulder is obstructed, and they must begin specific maneuvers to free it. There are no symptoms that a mother can feel or notice beforehand to predict this complication.

Causes & risk factors

Shoulder dystocia is often unpredictable, but certain factors can increase the risk, primarily those related to a larger baby or issues with the mother's health. Key risk factors include having a large baby, especially if the mother has diabetes, or if the mother has had shoulder dystocia in a previous pregnancy.

While shoulder dystocia can happen to anyone, some factors are more commonly associated with it. The most significant risk factor is having a large baby, a condition medically known as fetal macrosomia. This is particularly true if the mother has diabetes, either gestational diabetes (diabetes that develops during pregnancy) or pre-existing diabetes. Diabetes can cause babies to grow larger, especially in their upper body and shoulders. Other risk factors include the mother being obese, having a history of shoulder dystocia in a previous birth, or if the pregnancy goes beyond the due date (post-term pregnancy). Sometimes, a prolonged labor, either in the active phase or the second stage (pushing phase), can also increase the risk. Additionally, using assisted vaginal delivery methods, such as forceps or a vacuum extractor, may slightly raise the chance of shoulder dystocia. Rarely, a mother's small or abnormally shaped pelvis can contribute, though this is less common.

How it's diagnosed

Shoulder dystocia is diagnosed clinically by the healthcare team during labor. The diagnosis is made when your baby's head delivers, but their shoulders do not emerge with the next contraction or your pushing efforts. The "turtle sign," where the baby's head retracts slightly against the perineum, is a key visual cue that alerts providers to this emergency.

There are no tests or scans that can definitively diagnose shoulder dystocia before it occurs. Instead, it is a diagnosis made in real-time by the medical professionals attending the birth. Once your baby's head has been born, the team will observe for the natural progression of the shoulders. If the shoulders do not deliver spontaneously and the "turtle sign" is observed, the diagnosis of shoulder dystocia is made immediately. This triggers the rapid implementation of specific emergency maneuvers by the birthing team to help free the baby's shoulder. The quick recognition of these signs is crucial for timely intervention and to minimize potential complications.

Treatment options

Treatment for shoulder dystocia involves a series of urgent, specific maneuvers performed by the healthcare team to dislodge the baby's shoulder from behind the mother's pubic bone. These techniques aim to change the baby's position or the shape of the mother's pelvis, allowing the baby to pass through the birth canal safely and quickly.

The medical team will typically follow a sequence of maneuvers, starting with the least invasive. One common technique is the McRoberts maneuver, where the mother's legs are bent sharply back towards her abdomen. This position helps to flatten and open the pelvis, often creating more space. Another common step is suprapubic pressure, where a healthcare provider applies firm pressure to the mother's lower abdomen, just above the pubic bone, to try and push the baby's shoulder away from the bone. If these initial steps are not successful, the team may use internal maneuvers. This involves a provider inserting a hand into the vagina to rotate the baby's shoulder (Rubin maneuver) or to rotate the baby's entire body (Wood's screw maneuver). Another option is the Gaskin maneuver, where the mother is helped into a hands-and-knees position, which can also change the pelvic shape and aid delivery. In very rare and extreme cases, more invasive procedures might be considered, such as intentionally fracturing the baby's collarbone (clavicle) or, as a last resort, pushing the baby's head back into the birth canal for an emergency C-section (Zavanelli maneuver). A symphysiotomy, which involves cutting the cartilage of the pubic bone, is rarely performed, especially in the United States.

Recovery & outlook

Most babies and mothers recover well from shoulder dystocia, often without long-term issues. While some babies may experience temporary injuries like nerve damage or fractures, these usually heal completely over time. The medical team will closely monitor both you and your baby after delivery to ensure proper recovery and address any potential complications.

For the baby, the most common complication is a brachial plexus injury, which is damage to the nerves that control movement and sensation in the arm and hand. This occurs in about 4% to 40% of shoulder dystocia cases. Fortunately, most of these injuries are temporary and resolve fully within 6 to 12 months. Less commonly, a baby might sustain a fractured collarbone (clavicle) or arm bone (humerus), which typically heal well with proper care. Very rarely, severe lack of oxygen (hypoxia) can lead to brain damage or, in extremely rare instances, death. For the mother, common complications include heavy bleeding after birth (postpartum hemorrhage) and tears in the vagina or perineum. These usually heal with appropriate medical attention. Rarely, more severe complications like uterine rupture can occur. Many mothers also experience significant emotional or psychological distress following such an urgent and stressful birth experience. Support and counseling can be helpful for processing these feelings. Overall, the outlook is generally positive, with the majority of babies and mothers experiencing a full recovery.

When to see a doctor

If you have recently given birth and experienced shoulder dystocia, your medical team will closely monitor both you and your baby for any immediate complications. After discharge, you should contact your doctor if your baby shows any signs of arm weakness, limited movement, or unusual positioning of their arm or hand. Mothers should seek medical attention for excessive bleeding, severe pain, or signs of infection.

After a birth complicated by shoulder dystocia, your healthcare providers will perform thorough checks on your baby for any signs of injury, particularly to the arms and collarbone. They will also monitor you for excessive bleeding or other postpartum complications. Once you are home, it's important to be aware of potential signs that might require further medical evaluation. For your baby, watch for any noticeable weakness in one arm, difficulty moving an arm or hand, or if one arm appears to hang limply. These could be signs of a brachial plexus injury or a fracture. For yourself, seek immediate medical attention if you experience heavy vaginal bleeding that soaks more than one pad an hour, severe or worsening pain, fever, foul-smelling discharge, or any other concerning symptoms. Always discuss any worries or questions you have about your or your baby's recovery with your healthcare provider.

Frequently asked questions

Can shoulder dystocia be predicted or prevented?

Shoulder dystocia is largely unpredictable. While certain risk factors exist, such as a large baby or maternal diabetes, most cases occur without warning. Healthcare providers cannot reliably predict which births will be affected, making prevention difficult. Elective C-sections are only considered in very specific, high-risk situations, like an extremely large estimated fetal weight.

What are the long-term effects for a baby who experienced shoulder dystocia?

Most babies who experience shoulder dystocia recover fully without long-term effects. The most common injury, brachial plexus injury (nerve damage to the arm), is usually temporary and resolves within 6 to 12 months. Fractures of the collarbone or arm also typically heal well. Permanent severe injuries or brain damage are very rare.

How quickly do doctors need to act when shoulder dystocia occurs?

Doctors and the medical team must act very quickly when shoulder dystocia occurs because it is an obstetric emergency. The goal is to deliver the baby within a few minutes to minimize the risk of oxygen deprivation to the baby and reduce the chance of nerve damage or other complications. Rapid, coordinated action is crucial.

Does shoulder dystocia mean I will need a C-section for future pregnancies?

Not necessarily. If you had shoulder dystocia in a previous pregnancy, your doctor will discuss your individual risk factors for future births. They might recommend a planned C-section if there's a high estimated fetal weight or other significant risk factors. However, many women who have experienced shoulder dystocia can still have successful vaginal deliveries in the future.

What is the "turtle sign" and why is it important?

The "turtle sign" is a key visual cue during labor where, after the baby's head delivers, it retracts slightly back against the mother's perineum. It's important because it's the primary indicator that the baby's shoulder is stuck behind the pubic bone, signaling to the medical team that shoulder dystocia is occurring and immediate intervention is needed.

Can shoulder dystocia affect the mother's health long-term?

While most mothers recover well, shoulder dystocia can lead to complications like heavy bleeding (postpartum hemorrhage) or vaginal/perineal tears, which usually heal. Some mothers may experience lasting psychological distress or trauma from the emergency nature of the birth. Support and counseling can be beneficial for emotional recovery.

Sources

• MedlinePlus — Shoulder Dystocia
• Mayo Clinic — Shoulder Dystocia
• Cochrane Library — Shoulder Dystocia