Why Does Your Baby Shake Their Head Side to Side?

Babies shake their heads side to side for reasons that are most often ordinary: settling themselves, testing out new neck control, imitating the adults around them, or discovering that the motion feels interesting.

Up to 60% of babies show some form of rhythmic movement by 9 months of age, and these movements often occur around sleep.

It is worth a closer look if the movement comes with a fever, ear tugging, missed milestones, or a loss of skills your baby already had.

Is it normal for a baby to shake their head side to side?

Yes, in most cases. Side-to-side head shaking is common through the first year, and on its own it is usually a sign of ordinary development rather than a problem. A few things help you tell the difference.

Occasional or purposeful movement is generally nothing to worry about. Babies explore their own bodies constantly, and head shaking is one of the movements they discover.

Speed and intensity alone do not tell you much. Rapid or aggressive-looking head shaking can still be ordinary, and gentle movement is not automatically safe.

What matters more is the context it happens in, whether your baby stays responsive, whether anything else is going on alongside it, and whether it causes injury or disrupts sleep.

Isolated behavior matters. If head shaking is the only unusual thing you have noticed, it is very likely developmental. Head shaking alongside fever, ear pain, poor feeding, or missed milestones is a different situation.

A pattern that fades with age is expected. Rhythmic self-soothing movements decrease steadily through toddlerhood.

Whether your baby responds to you is useful information to note, though it is not a test. Babies settling themselves can often be interrupted or distracted, but being able to interrupt a movement does not rule out a seizure, and being unable to does not confirm one.

Movements that come with unresponsiveness, a blank stare, stiffening, or eye changes need prompt medical assessment regardless.

If something feels off to you, trust that instinct and call. A short video of the behavior on your phone is very useful at the appointment, since the movement often will not happen on demand in the exam room.

What are the normal causes of baby shaking head?

Most head shaking traces back to development, comfort-seeking, or plain curiosity. Here is what is usually behind it.

Developing motor skills

Around 4 to 6 months, infants gain better control of their neck muscles and whole body movements. Head shaking often appears in this same window, as babies discover a movement they can now produce on purpose.

It tends to show up alongside other new motor skills rather than being what builds them.

Self-soothing behavior

For some babies, gentle side-to-side head movement is a self-soothing technique they use when feeling stressed, tired, or overwhelmed. The repetitive motion can be calming for babies in a similar way that rocking or sucking provides comfort.

Rather than judging by how forceful or long the movement looks, consider the context it happens in, whether your baby stays responsive, and whether it causes injury, disrupts sleep, or comes with other symptoms.

Startle response

Startle response: Loud or unexpected sounds may cause babies to involuntarily jerk or briefly shake their heads as a natural startle reflex. This reaction is normal and typically doesn't persist for long.

This describes a brief startle or whole-body jerk in reaction to something, not the repeated rhythmic side-to-side head shaking covered elsewhere on this page.

Feeding at the breast or bottle

When feeding at the breast or bottle, some infants move their head slightly back and forth or from side to side in order to locate and latch on to the nipple. This motion is typically very mild and done for the purpose of feeding rather than as a deliberate behavior.

Teething

As early teeth push through the gums, it can be uncomfortable for babies. Teething and head shaking may coincide, sometimes alongside drooling, gum rubbing, and chewing on everything. Whether the movement itself eases gum discomfort is not established.

Play and imitation

Once a baby has seen an adult shake their head, many will copy it and turn it into a game. Babies often laugh while doing it and repeat it to get a reaction from you. Copying a gesture like this is an encouraging developmental sign rather than a worrying one.

Why does my baby shake their head when falling asleep?

Head shaking at bedtime and during naps is the version parents ask about most, and it has a specific name and a reassuring set of numbers behind it. Sleep specialists call these sleep-related rhythmic movements.

According to Cleveland Clinic, head rolling or shaking side to side is one of the three most common forms, along with body rocking and head banging.

Settling themselves is the usual explanation, though that is an interpretation of the behavior rather than something demonstrated in every individual case.

The numbers put this in perspective. Up to 60% of babies show some form of rhythmic movement by 9 months, a figure that covers all forms together rather than head shaking specifically.

The behavior usually subsides by age 2 to 3, and only around 5% of children still show it at age 5, so this is something most children grow out of on their own.

These movements are only classified as a disorder when they cause injury, disrupt your child's sleep, or affect them during the day. The American Academy of Sleep Medicine notes that children old enough to talk usually do not remember the episodes in the morning.

One thing worth noting as you observe it: babies settling themselves can often be interrupted or redirected. Treat that as useful information to report rather than as a test, since interruptibility does not reliably separate ordinary movement from a seizure in either direction.

Head shaking at different ages

The reason behind the movement tends to shift as your baby develops, though there is wide variation between babies.

Newborn to 3 months

Movement at this stage is mostly reflexive. Rooting for the breast or bottle and startle responses account for most of it, and deliberate head shaking is uncommon this early.

4 to 6 months

Neck control improves quickly, and many babies begin shaking their heads on purpose for the first time. Self-soothing at sleep time often appears here, and this is the age where parents most commonly notice it and start searching for answers.

6 to 9 months

Teething is often underway in this window, rhythmic movement around sleep is common, and imitation games begin. Head shaking may become more noticeable here, though there is no single age at which it peaks.

9 to 12 months and beyond

Head shaking increasingly becomes communicative, a gesture for "no," and rhythmic movements around sleep often begin to fade. Age on its own does not move concerning.

Raise it with your pediatrician if it causes injury, disrupts sleep, comes with illness, or appears alongside developmental changes or neurological signs.

Could head shaking be a sign of autism?

Head shaking by itself is not one of the recognized early indicators of autism. Autism is identified from a pattern of differences observed over time, not from any single movement.

The CDC's guidance is pattern-based, and it centers on social communication and developmental milestones. What it directs parents and clinicians toward includes whether a baby smiles back socially, responds to their name, babbles, uses gestures such as waving and pointing, and keeps gaining skills rather than losing them.

Repetitive movement can form part of an autism picture, but it appears alongside those social communication differences rather than on its own.

This is worth stating plainly because head shaking is so common in babies who are developing typically. Gesture use is one of the areas clinicians look at, and shaking the head is generally part of ordinary communication development.

That does not make head shaking a screening rule in either direction, and it is not something to use at home to rule autism in or out.

If you have questions about your baby's development, the CDC's Learn the Signs, Act Early program offers free milestone checklists, and your pediatrician can complete a developmental screening at a well-child visit. Bring a video and your notes.

What are the abnormal causes of a baby shaking its head?

A small number of medical causes are worth knowing about. In nearly all of them, head shaking is not the only symptom, which is what makes them easier to recognize.

Ear infection

An ear infection can cause pain when moving the head, and shaking may be a reaction to that discomfort.

According to the National Institute on Deafness and Other Communication Disorders, accompanying signs can include ear tugging, fussiness or crying, trouble sleeping, fever, fluid draining from the ear, balance problems, or reduced response to quiet sounds.

Head shaking on its own does not diagnose an ear infection, and it cannot be confirmed without an examination of the ear. 

Whether treatment is needed, and what kind, depends on what your pediatrician finds.

Vision problems

Issues like strabismus, sometimes called crossed eyes, or difficulty focusing can lead a baby to move their head more as they try to compensate. An eye that turns in or out, or eyes that do not move together, is worth having checked.

Neurological conditions

Rare conditions including seizures and some developmental delays can involve abnormal movements. Features that point away from ordinary head shaking include a blank or unresponsive stare during the episode, stiffening or jerking of the limbs at the same time, or a loss of skills your baby had already gained.

One pattern needs naming specifically, because timing matters for it. Infantile spasms are a rare type of seizure that typically begins between 2 and 12 months and peaks between 4 and 8 months. They come in clusters, with each brief spasm lasting a second or two and repeating every five to ten seconds.

They often happen just after your baby wakes, and they can look like a sudden forward bend or crunch of the head and body, a rapid head nod, or stiffening.

They can also resemble a startle, which is part of why they get missed. Soon after the spasms begin, some babies lose milestones or social responses they had already developed.

This pattern needs urgent medical evaluation, because how quickly it is recognized and treated affects the outcome.

Rapid or jerky eye movements together with head bobbing or an unusual head posture, a combination described by MedlinePlus, should be assessed rather than watched.

Head injury

If head shaking or unusual movement starts after a fall or a knock to the head, that timing matters. Vomiting, unusual drowsiness, difficulty waking, or a change in behavior after a head injury needs urgent medical care.

Illness with fever

Babies who feel unwell often move and fuss more. Head shaking with a fever points toward an infection somewhere rather than a movement problem, and the fever itself is the thing to act on.

Any fever of 100.4°F (38°C) or higher in a baby under 3 months needs immediate medical evaluation.

When should you call your pediatrician?

Most head shaking needs nothing more than an observant parent. These specific combinations are worth a call.

• Fever, ear tugging, or other signs of illness alongside the head shaking
• Movements that cannot be interrupted or redirected
• A blank stare, unresponsiveness, or limb stiffening during episodes
• Clusters of sudden stiffening, head or body crunching, or rapid nodding, especially just after waking
• Rapid or jerky eye movements, or an unusual head posture, alongside the head movement
• Head banging forceful enough to cause bruising or injury
• Movement that badly disrupts your baby's sleep or leaves them tired during the day
• Missed developmental milestones, or the loss of a skill your baby already had
• An eye that turns in or out, or eyes that do not track together
• Head shaking that starts after a fall or head injury
• Anything that has clearly changed from your baby's normal pattern

Record a short video before the appointment if you can. Movements rarely appear on cue in the exam room, and a clip gives your pediatrician far more to work with than a description.

Alongside the video, write down the details around it: what time of day it happens, how long each episode lasts, how often it occurs, what your baby was doing beforehand, whether they responded to you during it, and anything else you noticed at the same time such as fever, ear tugging, or unusual sleepiness.

That short record often tells a pediatrician more than the clip on its own.

Conclusion

Side-to-side head shaking in babies is usually a normal part of development. It commonly shows up as babies gain new motor control, explore how movement feels, imitate the adults around them, and settle themselves into sleep.

Rhythmic movement at sleep onset is especially common, reported in up to 60% of infants by 9 months across all its forms, and it usually fades on its own as children get older.

What deserves attention is the company the head shaking keeps.

Fever, ear tugging, unresponsiveness during episodes, clusters of stiffening or crunching just after waking, forceful head banging, missed milestones, or a skill your baby has lost are the reasons to call your pediatrician. Speed on its own is not the signal.

Head shaking in a baby who is feeding well, developing on track, and otherwise themselves is very likely one more thing they have figured out how to do.