Facial nerve palsy is a recognized complication of forceps-assisted childbirth. Pressure on the facial nerve may cause temporary weakness in the muscles controlling facial expression. Many newborns recover naturally, but persistent symptoms or incomplete eyelid closure require medical attention.
How forceps can affect the facial nerve
The facial nerve, also called the seventh cranial nerve, controls many muscles involved in facial expression.
It travels through the skull before branching toward the eyes, cheeks, and mouth.
Parts of its pathway are vulnerable to external pressure.
During forceps-assisted delivery, pressure near the baby's ear or jaw may compress the nerve.
This can temporarily interrupt signals to facial muscles.
The result is weakness on one side of the face.
However, facial nerve palsy can also occur without forceps use.
The delivery history helps doctors investigate the cause but does not establish it by itself.
Why symptoms appear during crying
A newborn's face may appear nearly symmetrical while resting.
During crying, the muscles become more active.
The unaffected side of the mouth moves normally.
The weaker side may remain relatively still.
This creates an uneven expression.
The corner of the mouth may droop or move less than expected.
The crease between the nose and mouth may also appear flatter.
Eye closure and facial movement
Some babies with facial nerve palsy cannot close one eyelid completely.
This is important because eyelid closure protects the cornea.
When the eye remains exposed, dryness and irritation can develop.
A clinician may recommend eye lubrication or other protective measures.
Parents should not apply medications or tape the eyelid without medical guidance.
Eye protection may be necessary even when the underlying nerve injury is expected to improve.
Distinguishing nerve injury from muscle differences
Not every newborn with an uneven crying face has facial nerve damage.
Some infants have asymmetric crying facies caused by underdevelopment of a lower-lip muscle.
In these cases, eye closure and forehead movement may remain normal.
A broader facial nerve palsy can affect additional muscle groups.
Doctors examine the entire face to distinguish these conditions.
Recovery after facial nerve compression
Many birth-related compression injuries improve over the first weeks or months.
Parents may notice more symmetrical crying and better eyelid closure.
However, recovery depends on the severity of nerve damage.
Persistent weakness may require evaluation by pediatric neurology or another specialist.
Severe structural injuries can have lasting effects.
When further testing may be needed
Most straightforward cases are diagnosed through examination and medical history.
Additional testing may be considered when weakness is severe, unusual, or persistent.
The clinician may evaluate whether the problem involves the nerve itself or another neurological condition.
MRI or nerve-function testing is not necessary for every newborn.
Local spotlight: Follow-up after hospital discharge
Parents should ask the newborn care team to document facial weakness and explain the follow-up plan.
Changes in eye closure, feeding, and facial movement can help clinicians assess recovery.
Any worsening symptoms should prompt reassessment.
Common questions around forceps-related facial palsy
Can forceps permanently damage the facial nerve?
Severe injuries can cause lasting weakness, but many compression injuries resolve.
Does every uneven crying face indicate nerve damage?
No. Congenital muscle differences can produce similar findings.
Is incomplete eye closure serious?
It can be because the exposed eye may become dry or injured.
