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Quick Answer
Newborns sometimes display trembling or shaking movements, particularly in their hands, arms, legs, or chin. These movements may occur when a baby cries, becomes startled, or is otherwise stimulated.
Some brief trembling movements reflect the immaturity of the newborn nervous system and can occur in otherwise healthy infants. However, shaking or jitteriness can also be associated with medical concerns, including low blood glucose, temperature disturbances, electrolyte abnormalities, medication exposure, or neurological conditions.
For Newborn Care Specialists, the important distinction is that not every trembling movement is a seizure, but not every trembling movement should be dismissed as normal.
Understanding the characteristics of newborn jitteriness, recognizing concerning patterns, and knowing when medical evaluation is necessary are essential professional skills.
Key Takeaways
- Brief trembling or jittery movements can occur in healthy newborns.
- The newborn nervous system is still developing, which can contribute to less coordinated movements.
- Jitteriness may become more noticeable during crying, handling, or stimulation.
- Some tremulous movements decrease when the affected limb is gently supported, but this observation cannot reliably rule out a medical problem.
- Low blood glucose and other medical conditions can cause newborn jitteriness.
- Seizures in newborns do not always look like seizures in older children or adults.
- Repetitive movements accompanied by abnormal breathing, color changes, or altered responsiveness require emergency evaluation.
- Persistent, unexplained, or recurrent shaking deserves prompt medical assessment.
- Newborn Care Specialists should never attempt to diagnose or treat neurological conditions.
- Objective documentation can help healthcare professionals understand what occurred.
Why Do Newborns Move Differently From Older Babies?
Newborn movement can look surprisingly uncoordinated.
Their arms may jerk suddenly.
Their legs may extend or flex.
Their hands may tremble.
Their chins may quiver during crying.
These movements occur because the neurological systems responsible for coordinating movement are still developing.
An older child can intentionally reach for an object, adjust their grip, and control the speed and direction of movement.
A newborn has much less voluntary motor control.
Early movement is influenced by reflexes, developing muscle control, sensory stimulation, and the ongoing maturation of the brain and nervous system.
That doesn’t mean every unusual movement is harmless.
It means newborn behavior must be understood within the context of early neurological development.
What Is Newborn Jitteriness?
Jitteriness generally refers to repetitive, tremulous movements that may involve the baby’s extremities.
The movements can appear rhythmic or shaking in nature.
They may be particularly noticeable when the baby is crying, being handled, or experiencing stimulation.
In some cases, the trembling decreases when the limb is gently supported or when the baby settles.
However, this characteristic is only one observation.
It is not a definitive way for an NCS to determine whether a movement is harmless.
The term jitteriness describes what is being observed. It does not establish the underlying cause.
Why Might a Healthy Newborn Tremble?
Some newborns display brief trembling movements without having an underlying medical disorder.
Their developing motor systems can produce movements that appear less smooth or controlled than those of older infants.
A newborn’s chin may quiver during crying.
The hands may tremble briefly when the baby becomes upset.
An arm may shake momentarily during a change in position.
When these movements are brief and the baby otherwise appears well, they may reflect normal developmental immaturity.
But the presence of an apparently normal explanation should never prevent a caregiver from recognizing other concerning symptoms.
What About Chin Trembling?
One of the most familiar examples of newborn trembling is a quivering chin.
Parents may notice the baby’s lower lip or chin shaking during crying.
This can occur as part of normal newborn motor activity.
However, caregivers should pay attention to the overall situation.
Does the movement happen only briefly during crying?
Does it stop when the baby settles?
Is the baby feeding normally?
Is the baby breathing comfortably?
Are there other unusual movements?
A brief chin quiver in an otherwise well newborn is different from repeated unexplained episodes accompanied by changes in responsiveness or breathing.
Can Crying Trigger Jitteriness?
Crying can make newborn trembling more noticeable.
During crying, babies experience changes in muscle activity, breathing patterns, and general arousal.
A newborn who is upset may display brief trembling of the hands, arms, legs, or chin.
But crying does not automatically explain every shaking episode.
If movements are prolonged, unusual, recurrent, or accompanied by concerning symptoms, medical assessment is appropriate.
An NCS should never reassure a family solely on the basis that the baby was crying when the movement occurred.
Could Low Blood Sugar Cause Newborn Shaking?
Yes.
Low blood glucose, also called hypoglycemia, is one potential medical cause of newborn jitteriness.
Glucose is an important energy source for the brain.
Some newborns are at increased risk of low blood glucose, including certain infants born prematurely, infants who are small or large for gestational age, and babies born to mothers with diabetes.
Symptoms can include jitteriness, poor feeding, lethargy, temperature instability, and other changes.
However, these symptoms are not specific to hypoglycemia.
A baby who appears jittery does not necessarily have low blood glucose, and some newborns with hypoglycemia may have no obvious symptoms.
Diagnosis requires appropriate medical assessment and glucose measurement.
What should an NCS do?
If a newborn develops unexplained or persistent jitteriness, particularly with poor feeding, unusual sleepiness, or other concerning symptoms, the family should seek prompt medical evaluation.
An NCS should not independently attempt to diagnose hypoglycemia or treat suspected low blood sugar by giving additional feeds outside the baby’s established care plan.
Can Temperature Affect Newborn Trembling?
Temperature disturbances can be associated with changes in newborn behavior.
Newborns regulate body temperature differently from adults and rely heavily on non-shivering thermogenesis to produce heat.
They do not depend on shivering as an effective primary mechanism for maintaining body temperature.
Therefore, visible shaking should not automatically be interpreted as a sign that the baby is cold.
If a newborn appears unusually cool or warm, use an appropriate thermometer according to the baby’s care instructions.
Avoid responding to unexplained shaking by simply adding layers of clothing.
A baby with an abnormal measured temperature or concerning behavior may require medical evaluation.
Can Medication Exposure Contribute to Jitteriness?
In some circumstances, prenatal exposure to certain medications or substances can influence newborn behavior after birth.
Depending on the exposure, newborns may experience symptoms involving feeding, sleep, muscle tone, irritability, or tremulous movements.
These situations require individualized medical evaluation.
An NCS should follow any established discharge or monitoring plan and avoid speculating about maternal medication use or pregnancy history.
Professional communication should remain respectful, objective, and confidential.
How Is Jitteriness Different From a Seizure?
This is one of the most important questions surrounding newborn shaking.
Some forms of newborn jitteriness and seizure activity can look similar to an untrained observer.
Historically, clinicians have described certain tremulous movements as more likely to be stimulus-sensitive and sometimes reducible with gentle support, whereas seizure activity may continue independently of stimulation.
However, these distinctions are not reliable enough for a newborn care professional to diagnose the cause.
Neonatal seizures can also be subtle.
They may not resemble the dramatic whole-body convulsions people commonly associate with seizures.
Possible manifestations can include unusual repetitive movements, abnormal eye movements, changes in breathing, or altered responsiveness.
Some neonatal seizures have no obvious outward movement at all.
An NCS should never attempt to determine that a baby is not having a seizure based on a home observation or by holding a limb still.
Suspected seizure activity requires immediate medical attention.
Seek emergency medical care when unusual movements occur with symptoms such as:
- Difficulty breathing or pauses accompanied by color change
- Blue or gray lips or tongue
- Loss of responsiveness or inability to arouse the baby
- Repeated seizure-like movements
- Significant changes in muscle tone or awareness
- A baby who appears seriously ill
Persistent or unexplained shaking without these emergency signs still warrants prompt medical assessment, especially in a newborn.
For babies younger than three months, a rectal temperature of 100.4°F (38°C) or higher also requires immediate medical evaluation.
An NCS should never wait for additional symptoms to develop when the baby is showing signs of a medical emergency.
What Should You Do If a Newborn Has a Suspected Seizure?
If a baby appears to be having a seizure, seek emergency medical assistance.
Protect the baby from injury by keeping them on a safe, flat surface.
Do not restrain their movements.
Do not put anything in their mouth.
Do not attempt to give food, milk, or medication during the episode.
Observe the baby’s breathing and color, and follow emergency dispatcher instructions.
If the baby is unresponsive and not breathing normally, follow emergency guidance and begin infant CPR if indicated and trained to do so.
If it is safe and does not delay emergency care, noting the duration and characteristics of the episode can help healthcare professionals.
A video may also be useful for medical evaluation, but recording should never take priority over the baby’s immediate safety.
Why the Overall Picture Matters
Imagine two different situations.
In the first, a newborn briefly trembles while crying during a diaper change. The movement stops as the baby settles, and the baby otherwise appears well.
In the second, a newborn develops repeated shaking movements while resting, becomes difficult to arouse, and has unusual breathing.
These situations require different levels of concern.
But an NCS should not diagnose either situation based on appearance alone.
The professional responsibility is to recognize the difference between a brief observation that can be discussed with the baby’s healthcare provider and a situation requiring immediate intervention.
Should Parents Try to Stop the Shaking?
Parents sometimes instinctively hold a baby’s arm or leg when they notice trembling.
Gentle support during ordinary handling is appropriate, but caregivers should not restrain a baby or manipulate a limb as a diagnostic test.
Trying to determine whether a movement stops when restrained is not a substitute for medical evaluation.
If a movement is unusual, recurrent, or concerning, the priority should be observing the baby safely and obtaining appropriate medical guidance.
How Should an NCS Document Unusual Movements?
Documentation is particularly important when an unusual movement occurs intermittently.
A healthcare provider may not witness the episode during an appointment.
Accurate observations can therefore be valuable.
Document:
- When the movement occurred
- How long it lasted
- Which body parts were involved
- Whether the baby was asleep, awake, feeding, or crying
- Whether there was an apparent trigger
- Whether breathing or skin color changed
- Whether the baby responded normally
- Whether the movement stopped spontaneously
- What action was taken
- When the parents or healthcare provider were notified
For example:
“At 2:15 a.m., rhythmic trembling observed in both hands for approximately five seconds while baby was crying during diaper change. Movement stopped after baby settled. Breathing and color appeared unchanged. Parents informed.”
Compare that with:
“Baby had a harmless tremor.”
The second statement is a conclusion rather than an observation.
Professional documentation should describe what happened without attempting to diagnose the cause.
How Can an NCS Discuss Jitteriness With Parents?
New parents may become frightened when they see their baby’s body shake.
A calm response is important, but reassurance should not replace appropriate evaluation.
Instead of saying:
“That’s completely normal. All newborns do that.”
Consider:
“Some brief trembling movements can occur during normal newborn development, but there are also medical reasons babies can appear jittery. Let’s document exactly what happened and discuss it with your pediatrician.”
This approach acknowledges the parent’s concern without creating unnecessary alarm or offering false certainty.
Parents may encounter videos claiming that every newborn tremor is harmless or that certain movements definitively indicate a neurological condition.
Neither extreme is helpful.
A short video cannot provide the full clinical context needed to evaluate a newborn.
Healthcare professionals may consider the baby’s gestational age, birth history, feeding, glucose levels, temperature, neurological examination, and other findings.
In some cases, additional testing is necessary.
An NCS should help families understand that accurate medical assessment requires more than comparing their baby with a video online.
What Does the Research Say?
Medical literature recognizes neonatal jitteriness as a clinical observation that can occur in otherwise healthy newborns but may also be associated with underlying conditions.
Potential causes include neurological immaturity, hypoglycemia, electrolyte disturbances, and other medical concerns.
Research and clinical guidance also emphasize that neonatal seizures can be difficult to identify through observation alone.
The International League Against Epilepsy recognizes the importance of electroencephalographic assessment in accurately identifying neonatal seizures.
For newborn care professionals, the evidence supports a cautious and practical approach.
Understand that brief trembling can occur during normal development.
Recognize that appearance alone cannot reliably establish the cause.
And ensure that persistent, unexplained, or concerning movements receive appropriate medical evaluation.
Why Education Matters
Newborns display many behaviors that can look unusual to inexperienced caregivers.
They startle.
They twitch during active sleep.
Their chins may quiver.
Their arms may move suddenly.
Their hands may tremble.
Understanding normal neurological development helps professionals interpret these observations more thoughtfully.
But education also teaches us the limits of what can be determined without medical assessment.
A knowledgeable NCS doesn’t need to have an explanation for every movement.
Sometimes the most important professional skill is recognizing that an observation requires someone with a different scope of practice.
Interested in Learning More About Newborn Neurological Development?
Newborn behavior reflects an extraordinary period of neurological growth and adaptation.
Understanding reflexes, motor development, feeding, sleep, temperature regulation, and warning signs helps newborn care professionals provide more informed support.
At Newborn Care Solutions®, our educational programs help Newborn Care Specialists, nannies, postpartum doulas, and other infant care professionals strengthen their knowledge of newborn development, physiology, safety, and professional practice.
Whether you’re beginning your career or expanding your existing expertise, continuing education can help you recognize normal newborn behaviors while understanding when additional medical guidance is necessary.
Not sure which training path is right for you?
Take our free NCS Training Path Quiz:
References
- Huntsman, R. J., Lowry, N. J., & Sankaran, K. (2008). Nonepileptic motor phenomena in the neonate. Paediatrics & Child Health, 13(8), 680–684.
- Pressler, R. M., et al. (2023). Treatment of seizures in the neonate: Guidelines and consensus-based recommendations—Special report from the ILAE Task Force on Neonatal Seizures. Epilepsia, 64(10), 2550–2570.
- Canadian Paediatric Society. (2025). The screening and management of newborns at risk for low blood glucose.
- MedlinePlus. Neonatal Seizures and Infant Health Resources.
- American Academy of Pediatrics. HealthyChildren.org. Newborn Health and Development Resources.
Final Thoughts
Newborns don’t move like older babies.
Their nervous systems are still developing, and some movements that appear unusual to adults can occur during normal early development.
A brief trembling chin or shaking hand may be part of that picture.
But similar-looking movements can also be associated with medical conditions that require attention.
For Newborn Care Specialists, the goal isn’t to label every movement as normal or abnormal.
It’s to observe carefully, understand the possible significance of what you’re seeing, and recognize when the situation requires medical evaluation.
Professional newborn care isn’t about having an immediate answer for everything. It’s about having the knowledge and judgment to know when an answer needs to come from a healthcare professional.