Ataxic cerebral palsy
The short answer
Ataxic cerebral palsy is the type that affects balance and coordination. Movements are shaky and imprecise, and a child may look unsteady even standing still. 1
It is the least common of the four types. It comes from a difference or an injury in the cerebellum, the part of the brain that fine-tunes movement.
The numbers, up front
- How common
- Ataxic cerebral palsy is the least common of the four types 1
- Where the problem is
- The cerebellum, which fine-tunes the timing and accuracy of movement rather than starting it 1
- Why genetic testing matters here
- A cerebellar picture with a normal or non-specific MRI is one of the situations where an underlying genetic or metabolic cause is most likely to be found 1
- What the movement looks like
- A wide-based unsteady walk, a tremor that appears as the hand approaches a target, and difficulty judging distance and force 1
- Diagnosis timing
- Ataxic cerebral palsy is often recognized later than the other types, because balance problems only become visible once a child begins sitting, standing and walking 2
How does this happen?
The cerebellum does not decide to move. It corrects movement while it is happening, comparing what the body meant to do with what it is actually doing, hundreds of times a second.
When it works poorly, movements start fine and then go wrong. A hand reaching for a cup overshoots and corrects and overshoots again. Standing still becomes an active job, because standing is really a constant series of small corrections.
Causes include a cerebellum that did not develop typically, injury to the cerebellum, and a number of genetic and metabolic conditions. Because the cerebellum can look normal on imaging while working abnormally, the MRI in ataxic cerebral palsy is more often unremarkable than in the other types. 1
That last point drives the most important practical difference in this type. A child with an ataxic picture and a non-specific MRI needs a genetic and metabolic workup, because some conditions that look like ataxic cerebral palsy are progressive and a few are treatable. 1
What causes it?
Two different questions get mixed together here. The first is what leads to this injury in the body. The second is whether anyone could have prevented it. They are not the same question, and the answer to the first does not settle the second.
Happens even with perfect care
- A cerebellum that did not form typically during pregnancy, for reasons that are usually unknown.
- Genetic conditions affecting the cerebellum. 1
- Metabolic conditions, some of which are treatable if found.
- Very preterm birth with cerebellar injury or bleeding. 3
- Infection during pregnancy. 4
Associated with gaps in care
These are situations where published standards say what the care team should watch for and do. A gap here does not prove anyone caused your child's injury. It points to where the medical records will have an answer.
Ataxic cerebral palsy is less often linked to events during labor than the other types, which changes what is worth examining.
- A missed or delayed diagnosis of an underlying genetic or metabolic condition, where the finding would have changed treatment, family planning, or the monitoring of other organs. 1
- A progressive condition labeled as cerebral palsy without follow-up. Cerebral palsy does not progress. A child whose abilities are declining needs the diagnosis revisited, not confirmed.
- Very preterm birth care, where the general preterm standards apply, including magnesium sulphate for neuroprotection before 32 weeks. 5
- Untreated maternal infection. 6
Whether any of this amounts to a departure from the standard of care takes a physician expert reading the whole record.
What are the signs, by age?
Signs change as a child grows. A newborn cannot show you a walking problem. Some children look fine at first and show differences months later.
At birth and the first hours
Usually nothing. Ataxia cannot be seen in a newborn because a newborn does not yet do anything that requires balance.
The first week
- Low tone in some babies.
- Feeding difficulty.
- Nothing specific in most.
Around 3 months
- Low muscle tone.
- Head control that is late or wobbly.
- Sometimes shaky eye movements, called nystagmus.
Around 6 months
- Sitting that is late, or sitting with a lot of wobble.
- Reaching that misses the target and corrects.
- Low tone that persists.
Around 12 months
- Sitting or standing with a very wide base.
- A tremor that shows up as the hand nears an object rather than at rest.
- Late walking.
Toddler years
- A wide, unsteady, staggering walk.
- Frequent falls, particularly when turning or stopping.
- Difficulty with stairs, curbs and uneven ground.
- Speech that is uneven in rhythm and volume, sometimes called scanning speech.
- Trouble with cups, spoons and stacking.
School age
- Handwriting is often hard, and this is worth accommodating rather than drilling.
- Fatigue, because balance takes constant effort.
- Difficulty in crowded, moving environments such as hallways and playgrounds.
- Learning differences in some children, and typical learning in many.
None of this is a diagnosis. Children develop at different speeds and one late skill on its own usually means nothing. Bring what you see to your pediatrician, and ask for a referral to early intervention if you are worried. You do not need a diagnosis to be referred.
How is it diagnosed?
Diagnosis is clinical, and it usually comes later than for the other types because balance problems only appear once a child sits, stands and walks. 2
A neurologist looks for a wide-based gait, an intention tremor that grows as the hand approaches a target, difficulty with rapid alternating movements, and nystagmus.
MRI is done and is often normal or shows only a small or unusually shaped cerebellum. 1
Because of that, genetic and metabolic testing is a bigger part of the workup here than in any other type of cerebral palsy. Ask for it directly if it has not been offered. The reasons are practical: some conditions that mimic ataxic cerebral palsy get worse over time, a few respond to treatment, and the answer changes what families are told about recurrence. 1
One rule is worth holding on to. Cerebral palsy is not progressive. If a child is losing skills they used to have, the diagnosis needs to be re-examined. 1
What is the treatment?
There is no medicine that treats ataxia itself well. Treatment is about making function possible and safe.
- physical therapy focused on balance, core strength, and safe falling. Practice is specific: balance improves at the tasks you practice.
- occupational therapy for hand control, and for tools that reduce the tremor's effect, such as weighted utensils, larger handles and stabilized cups.
- speech-language pathology for speech rhythm and clarity, and for feeding if swallowing is unsteady.
- Equipment, which often means a walker or a wheeled frame for distance and busy places, even for a child who walks at home. This is about energy and safety, not about giving up.
- Environment, including handrails, non-slip surfaces, and seating with arms.
- Treating what is treatable, if a metabolic cause is found.
Goal-directed practice, aimed at a specific task the family picked, has better evidence than general handling. 7
What is the long-term outlook?
Most children with ataxic cerebral palsy walk, and many walk independently, though often later than other children and with a wide, effortful gait. 1
Hand skills usually stay affected, which shows up most in writing, self-feeding and fastenings. Accommodations at school matter more here than practice does.
Because ataxic cerebral palsy is the type most often associated with an underlying genetic condition, the long-term picture may depend on that condition rather than on the ataxia itself. That is another reason to get the testing done. 1
Fatigue is a genuine and underestimated feature. Balance is expensive.
What does daily life look like?
Falls and near-falls, all day, in a child who is trying hard. Homes get modified: rails, rugs removed, corners softened.
Eating is often messy and slow, and this becomes socially hard at school age. Adaptive utensils and a plan for lunch help more than reminders to be careful.
Fatigue shapes the school day. Ask for a rest option and for reduced handwriting demands in the IEP, and ask for them before the child starts failing to keep up.
What does care cost over a lifetime?
No agency publishes a lifetime cost specific to ataxic cerebral palsy. The CDC estimate of about $921,000 in 2003 dollars covers cerebral palsy as a whole. 8
Ataxic cerebral palsy usually sits below that average when it occurs on its own, because fewer children need surgery, complex seating or personal care. It sits above it when an underlying genetic condition brings needs of its own.
See the cost of care estimator.
What can you do this week?
- Ask directly whether genetic and metabolic testing has been done. If not, ask why not.
- Ask whether your child has ever lost a skill they had. If the answer is yes, say so clearly to the neurologist.
- Ask for a balance-focused physical therapy plan with a named goal.
- Ask occupational therapy about adaptive utensils and writing tools now, not at school age.
- Refer to early intervention or the school district.
- Walk your home looking for fall risks.
What should you ask each specialist?
Take these with you. Write the answers down in the moment, because you will not remember them later.
For the neurologist
- What did the MRI show in the cerebellum?
- What genetic or metabolic testing has been done, and what is left?
- Is there any sign this is progressing rather than static?
- What would make you revisit the diagnosis?
For the therapy team
- What balance goal are we working on, and how will we measure it?
- Should my child use a walker for distance even though they can walk?
- What adaptive tools would help with eating and writing?
- How do we build in rest so fatigue does not eat the school day?
You can also build a printable list with the question generator.
Codes you may see on paperwork
These are ICD-10-CM codes. They are how hospitals and insurers label a diagnosis. Seeing one on a bill or a chart tells you what was recorded, not how severe it is. 9
| Code | What it means |
|---|---|
| G80.4 | Ataxic cerebral palsy |
| G11.9 | Hereditary ataxia, unspecified, used where a genetic cause is identified |
Questions parents ask
My child gets shakier when they reach for something. Why?
That is an intention tremor, and it is characteristic of a cerebellar problem. At rest there is little to correct. During a reach, the cerebellum has to make constant corrections, and when it works poorly the corrections overshoot. It is not nerves or anxiety. 1
Should we get genetic testing?
In ataxic cerebral palsy, usually yes. It is the type where an underlying genetic or metabolic cause is most likely to be found, and the answer can change treatment and what your family is told about recurrence. Ask for it directly. 1
My child seems to be getting worse. Is that normal for cerebral palsy?
No. Cerebral palsy is not progressive. Muscles can tighten and walking can get harder with growth, but a child who is genuinely losing skills they had needs the diagnosis re-examined. Say the words "my child has lost a skill" to the neurologist, because that phrase changes the workup. 1
Words on this page, in plain English
- standard of care
- What a reasonably careful provider would have done in the same situation. It is proven with expert testimony, not with a guideline alone.
- MRI
- Magnetic resonance imaging. A scan that uses magnets, not X-rays, to make detailed pictures of the brain.
- physical therapy
- Therapy for large movements: head control, rolling, sitting, crawling, standing, and walking.
- occupational therapy
- Therapy for hands and daily life: reaching, grasping, feeding, dressing, and play.
- speech-language pathology
- Therapy for communication and for safe eating and drinking.
- IEP
- Individualized Education Program. The written special education plan for a school-age child, with goals, services, and minutes.
- early intervention
- The public program that provides therapy and support to children under 3 with delays or diagnosed conditions. It is required by federal law.
Where these facts come from
- National Institute of Neurological Disorders and Stroke. Cerebral Palsy. 2025. www.ninds.nih.gov/health-information/disorders/cerebral-pals. Link checked September 3, 2026.
- JAMA Pediatrics. Early, Accurate Diagnosis and Early Intervention in Cerebral Palsy. 2017. jamanetwork.com/journals/jamapediatrics/fullarticle/2636588. Link checked September 3, 2026.
- Elsevier. Volpe's Neurology of the Newborn, Sixth Edition. 2018. www.elsevier.com/books/volpes-neurology-of-the-newborn/volpe. Link checked September 3, 2026.
- American College of Obstetricians and Gynecologists and American Academy of Pediatrics. Neonatal Encephalopathy and Neurologic Outcome, Second Edition. 2014. www.acog.org/clinical/clinical-guidance/task-force-report/ar. Link checked September 3, 2026.
- Cochrane Database of Systematic Reviews. Magnesium sulphate for women at risk of preterm birth for neuroprotection of the fetus. 2024. www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD004661.p. Link checked September 3, 2026.
- American College of Obstetricians and Gynecologists. Committee Opinion 797, Prevention of Group B Streptococcal Early-Onset Disease in Newborns. 2020. www.acog.org/clinical/clinical-guidance/committee-opinion. Link checked September 3, 2026.
- Current Neurology and Neuroscience Reports. State of the Evidence Traffic Lights 2019: Systematic Review of Interventions for Preventing and Treating Children with Cerebral Palsy. 2020. pubmed.ncbi.nlm.nih.gov/32086598/. Link checked September 3, 2026.
- CDC, MMWR. Economic Costs Associated with Mental Retardation, Cerebral Palsy, Hearing Loss, and Vision Impairment, United States, 2003. 2004. www.cdc.gov/mmwr/preview/mmwrhtml/mm5303a4.htm. Link checked September 3, 2026.
- Centers for Medicare and Medicaid Services. ICD-10-CM Files. 2025. www.cms.gov/medicare/coding-billing/icd-10-codes. Link checked September 3, 2026.