Key takeaways

  • An upgoing big toe (positive Babinski) is the NORMAL response in babies under about 12 months and may persist up to 18 to 24 months as the brain's motor pathway matures.
  • The same response in an adult or a child older than 2 years can signal a problem in the brain or spinal cord, which is why context and age matter.
  • A persistent strong upgoing toe beyond 24 months, or any asymmetry between the two feet at any age, should be reviewed by a paediatrician.
  • Worry less about a single reflex and more about the full picture: motor milestones, muscle tone, head growth, and feeding.
  • Leave reflex testing to the paediatrician at routine visits; repeated home testing is uninformative and can distress the baby.
  • Most babies referred for a persistent Babinski turn out to be normal late-developers; early review simply ensures nothing is missed.

What is the Babinski reflex?

The Babinski reflex (also called the Babinski sign or plantar response) is what the toes do when the sole of the foot is firmly stroked. There are two possible responses:

  • Flexor (downgoing) response: all the toes curl downward. This is the normal response in healthy adults and older children.
  • Extensor (upgoing) response: the big toe lifts up toward the shin and the other toes often fan out. This is called a positive Babinski.

In babies, the upgoing response is the expected, healthy finding. The reason lies in the brain's main motor pathway, the corticospinal tract, which runs from the cortex down through the brainstem and spinal cord. In adults this pathway suppresses the primitive upgoing response, so the toes curl down. A baby's corticospinal tract is not yet fully insulated: the myelin sheath that speeds up nerve signals is laid down gradually over roughly the first 18 to 24 months of life. Until that insulation matures, the primitive upgoing response naturally shows through.

This is why a positive Babinski is reassuring in a baby but significant in an adult, where it can point to a stroke, spinal cord injury, multiple sclerosis or another upper motor neuron problem. The age of the person is everything. The Babinski is one of several primitive newborn reflexes, alongside the Moro or startle reflex, that paediatricians track for normal appearance and timely disappearance as part of routine developmental milestone checks.

How doctors check the Babinski reflex

The reflex is tested by firmly but gently stroking the sole. The doctor runs a blunt stimulus (the handle end of a reflex hammer, a tongue depressor, or often just a thumbnail in babies) along the outer edge of the sole from the heel toward the toes, then curves it across the ball of the foot toward the big toe. The foot needs to be warm and the baby relaxed, because a cold or ticklish baby simply pulls the foot away and the response cannot be read.

The doctor watches what the big toe does. An upgoing big toe, often with the other toes fanning out, is a positive Babinski. In babies the response varies a lot: some show a quick brief lift, some a sustained one, some clear fanning, some only the big toe moving. All of these are within the normal infant range.

Equivocal or unclear responses are common and are also normal. A baby may withdraw the whole foot without a clear toe response, or give different responses on repeat testing. This is exactly why a careful examination repeats reflexes and looks for consistency rather than reading too much into one attempt.

A few things are easy to mistake for a true Babinski:

  • Withdrawal: the whole foot and leg pull away from the stimulus. This is a protective withdrawal, not a Babinski.
  • Ticklishness: the baby giggles and wriggles, the foot moves randomly, and the test cannot be interpreted.
  • Spasticity: in a baby with an established neurological condition the response is exaggerated and sustained, sometimes with rhythmic ankle jerking (clonus).

This is also why testing the reflex repeatedly at home is unhelpful. One sign read in isolation, without the rest of a neurological examination (muscle tone, motor milestones, deep tendon reflexes, head circumference, behaviour), is unreliable and can cause needless worry. If you are concerned about your baby's development, book a paediatric visit rather than searching for the technique online and trying it yourself.

When the Babinski reflex normally disappears

The age at which the upgoing toe gives way to the adult downgoing toe is one of the most variable things in child neurology. The change is gradual, not sudden, and it tracks how quickly the individual baby's motor pathways mature.

Use this as a rough guide rather than a rigid rule, and always interpret it alongside your baby's overall development:

Asymmetry matters at any age

Whatever the age, the response should be broadly similar in both feet. A consistently upgoing toe on one side and a downgoing toe on the other is the finding that most concerns paediatricians, because asymmetry points to a one-sided (focal) problem in the brain or spinal cord. Causes in babies include perinatal stroke (which can happen even after an apparently uncomplicated birth), a focal brain difference, or hemiplegia of any cause.

The key principle is context. An 18-month-old with a lingering upgoing toe but normal walking, normal muscle tone, and age-appropriate skills is very likely just a slower-than-average late developer. An 18-month-old with a lingering upgoing toe plus delayed milestones, stiff or floppy tone, or asymmetric movement is a different situation and needs evaluation. The reflex is read as one piece of the whole picture, never alone.

When to see a doctor

Most Babinski findings in babies are normal and need nothing beyond routine developmental checks. Book a paediatric appointment (and ask specifically about a paediatric neurology referral) if you notice any of the following. Many of these warrant attention regardless of the reflex itself:

What a paediatric neurology review involves in India

If your baby is referred, knowing the steps helps reduce anxiety. A paediatric neurology assessment combines a detailed history, a thorough examination, and only the tests that the findings actually call for.

History: the doctor asks about the pregnancy, the birth (gestation, delivery, birth weight, NICU admission), early development (when your baby smiled, held the head up, rolled, sat), feeding, and family history. The history is often the single most useful part of the visit.

Examination: head circumference and growth, muscle tone in all four limbs, power, deep tendon reflexes, the primitive reflexes for age, cranial nerves, and overall behaviour and developmental level. Examining a baby takes patience, and a complete assessment sometimes needs more than one visit.

Tests, only if indicated:

  • MRI of the brain (sometimes the spine) is the usual scan when an upper motor neuron problem is suspected. Young children often need light sedation to stay still for the 30 to 45 minute scan. It is free at government tertiary hospitals and typically ₹3,500 to ₹15,000 in private centres.
  • EEG is done if there is any suggestion of seizures (around ₹1,500 to ₹5,000 privately).
  • Metabolic blood tests or genetic testing are reserved for selected cases.

Well-regarded paediatric neurology centres in India include AIIMS Delhi, NIMHANS Bengaluru, SCTIMST Trivandrum, CMC Vellore, and Rainbow Children's Hospitals across several cities. Consultation at private centres is usually ₹500 to ₹3,000; care at AIIMS and government tertiary hospitals is free or minimal cost.

Afterwards: most reviews end in reassurance and continued monitoring. Where a need is found, the plan may include physiotherapy, occupational therapy or speech therapy, and follow-up is usually every 3 to 6 months. The Rashtriya Bal Swasthya Karyakram (RBSK), run under the Ministry of Health, offers free screening and early-intervention services for eligible children through District Early Intervention Centres.

The Babinski sits within a fuller picture of newborn reflexes

Babinski is one of several primitive reflexes that paediatricians track together. A single reflex lingering a little is usually a normal variant; several lingering alongside delayed milestones is what raises concern. Here is how the common ones normally behave. You can read more in our full guide to newborn reflexes and what they mean:

Babinski in preterm babies and NICU graduates

India has one of the highest preterm birth rates in the world, so this is a common and important situation. Preterm babies follow their own developmental schedule, and reflexes must be judged accordingly.

The key idea is corrected age: for the first two to three years, a preterm baby's development is measured from the expected due date, not the birth date. A baby born at 32 weeks who is 8 weeks old chronologically is at term-equivalent (corrected age zero). So a preterm baby with an upgoing toe at a chronological 30 months but a corrected 24 months is at the upper edge of normal, not automatically a worry, unless other concerns are present. The myelination that switches the reflex to downgoing happens over the first 18 to 24 months of corrected age.

Some patterns in preterm babies need monitoring but are often not permanent, including a phase of increased tone and posturing between roughly 3 and 9 months corrected age that frequently settles, and mild motor delays that catch up by 2 to 3 years. The condition paediatricians most want to catch early is cerebral palsy, suggested by persistent abnormal tone, delayed milestones, lingering primitive reflexes, asymmetry, and a persistent upgoing toe. Early diagnosis allows early therapy, which improves outcomes.

For babies with a higher-risk history (born under 28 weeks, very low birth weight, significant brain bleed, periventricular changes, neonatal seizures, or oxygen deprivation), structured follow-up under the IAP and National Neonatology Forum protocols schedules developmental checks at term and at 3, 6, 9, 12, 18 and 24 months corrected age. Most large Indian tertiary NICUs run a high-risk follow-up clinic for exactly this. If your baby was born early or premature, the broader picture is covered in our guide to preterm labour and premature birth, and skin-to-skin care, as explained in our kangaroo mother care guide, supports preterm neurodevelopment.

Cultural beliefs and family conversations in India

Indian families often bring cultural frames to a baby's unusual movements, from nazar (the evil eye) to astrological readings of the birth chart or an Ayurvedic view of dosha balance. These beliefs carry real meaning, and they can sit alongside medical care rather than replace it. Prayer, religious community and naming ceremonies are entirely compatible with seeing a paediatrician.

A common scene in joint families is a grandparent saying, "This is just normal, every baby is different, do not waste money on tests." The love behind that is genuine. A helpful reply validates the intent while explaining the reasoning: the paediatrician saw a specific finding, early identification of any problem allows earlier therapy with better outcomes, and the clinical examination itself is harmless. Offering to bring the relative to the next appointment so they can hear the doctor directly often resolves the tension.

Two practical cautions. First, astrological or spiritual remedies are a personal choice and usually harmless, but they should never delay a medically indicated evaluation. Second, some traditional remedies given to babies, such as unknown herbal mixes or unprescribed substances applied to the skin or fed to the baby, can be actively harmful; check anything like this with your paediatrician first.

Families navigating an evaluation often find support through organisations such as the Indian Association of Cerebral Palsy and parent groups linked to major paediatric neurology centres.

Supporting healthy development at home

Rather than testing reflexes, the most useful thing you can do is support your baby's overall development and keep routine checks. A few evidence-based habits:

  • Tummy time from the early weeks builds the neck, back and arm strength that underlies rolling, sitting and crawling. The AAP and IAP recommend short, supervised sessions several times a day, increasing as your baby tolerates it. See our practical guides to tummy time for babies and progressing tummy time as your baby grows.
  • Floor play and free movement: time on a firm, safe mat to kick, reach and push up. Avoid long stretches in baby seats or carriers, and skip baby walkers entirely, as explained in our baby walker safety guide.
  • Interaction: talking, singing, reading aloud and responding to your baby's cues all feed motor, language and social development together.
  • Nutrition: exclusive breastfeeding for 6 months, then appropriate complementary foods, with vitamin D and iron as advised. Iron-deficiency anaemia is very common in Indian children and affects motor and cognitive development, so it is worth preventing. Our explainer on iron deficiency covers the basics that apply across the family.
  • Routine checks: keep the IAP and government developmental and baby vaccination visits, which include milestone and reflex review. These are the right moments to raise any worry.

A short note on what not to do: do not over-test reflexes at home, do not obsessively compare your baby with others (the normal range is wide), and do not delay a paediatric visit if you have a genuine concern. If you are still in the first weeks, our newborn care guide for the first week covers the essentials of feeding, sleep and cord care.

Frequently asked questions

My baby's big toe goes up when the doctor strokes the foot. Is something wrong?

Almost certainly not. An upgoing big toe (positive Babinski) is the normal, expected response in babies, because the brain's motor pathway is still maturing. It typically becomes a downgoing toe between 12 and 24 months. The same response only becomes a concern in a child older than 2 years or if there is asymmetry between the two feet.

At what age should the Babinski reflex disappear?

It gradually shifts from upgoing to downgoing over the first two years. Most babies have a clearly downgoing toe by 18 months, and virtually all neurologically normal toddlers by 24 months. A consistently upgoing toe beyond 24 months should be reviewed by a paediatrician.

Should I test the Babinski reflex on my baby at home?

No. A single reflex read on its own, without the rest of a neurological examination, is unreliable and can cause needless worry or false reassurance. It also tends to distress the baby. Leave reflex testing to the paediatrician at routine developmental visits, and raise any specific concerns there.

What does asymmetry in the Babinski reflex mean?

If one foot reliably gives an upgoing toe and the other a downgoing toe, that asymmetry should always be reviewed, at any age. It can point to a one-sided problem in the brain or spinal cord, such as a perinatal stroke or hemiplegia, where early identification and therapy genuinely help.

My baby was born premature. How should I read the reflex?

Use corrected age, measured from the expected due date rather than the birth date, for the first two to three years. The reflex switches to downgoing over the first 18 to 24 months of corrected age, so a lingering upgoing toe in a preterm baby is often within normal limits unless there are other concerns. High-risk preterm babies are followed in structured NICU follow-up clinics.

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