Early Signs of Cerebral Palsy in Babies and Toddlers: A Parent’s Age-by-Age Guide
If something about your baby’s movement has been worrying you — you are right to look into it. This guide walks you through the warning signs of cerebral palsy from birth to 24 months, in plain language. No medical degree needed. Just the information you need to know what to look for, and exactly what to do next.
Why spotting signs early changes the outcome
Cerebral palsy is caused by a brain injury that happens before, during, or shortly after birth. The injury itself is permanent — but the effects it has on your child’s movement and independence are not fixed. They depend enormously on when treatment starts.
In the first two to three years of life, a baby’s brain is at its most flexible. It is actively forming new connections and can route around damaged areas in ways it simply cannot do later. When physiotherapy starts in this window, the brain can build more typical movement patterns before abnormal ones become deeply set. When spasticity is caught before it shortens muscles and stiffens joints, complications that would otherwise take years to fix can be stopped before they start.
Every month gained matters. A child who begins physiotherapy in year one — and reaches surgical treatment from age two — has the best possible chance of outcomes that genuinely surprise people around them.
The one thing to take from this section: You do not need a formal diagnosis to start physiotherapy. If something about your baby’s movement feels off, start therapy now and investigate in parallel. Waiting for a confirmed diagnosis before doing anything is one of the most common — and most avoidable — delays families experience.
Warning signs, age by age
Cerebral palsy looks different depending on your child’s age, because what we expect a baby to be able to do changes rapidly in the first two years. Below is what to watch for at each stage.
A note before you read: No single sign below means your baby definitely has CP. What raises concern is a pattern — several signs together, signs that persist instead of fading, or signs in a baby who already has a known risk factor like premature birth, a difficult delivery, or a brain abnormality found on a scan.
Signs in newborns and early infants
- Unusually floppy — when you pick them up, their body feels limp, like a ragdoll. Their head drops back and their limbs don’t push back against you at all.
- Or unusually stiff — the opposite problem: arms and legs that feel very rigid, or that are difficult to bend gently when changing or dressing them.
- Trouble feeding — a very weak suck, difficulty latching, choking on milk, or feeds that take far longer than they should.
- Arched back — especially noticeable when crying or upset, as though they are trying to throw their head backward.
- Jerky or trembling movements — limbs that shake or quiver rather than moving smoothly.
- One side less active — one arm or leg that moves noticeably less than the other, with no injury to explain it.
Signs in babies at 3 to 6 months
- Hand stays in a tight fist — most babies naturally start opening and closing their hands by 3 months. If one or both hands stay clenched most of the time, that is worth noting.
- Head still drops back — when pulled gently from lying to sitting, the head should stay roughly level with the body by 4 months. If it still falls straight back, head control is lagging.
- Not reaching for things — by 4 to 5 months, babies typically swipe at objects and stretch toward faces. Not doing this, or only ever using one arm, is an early concern.
- Legs scissor when held upright — when held under their arms, their legs cross stiffly over each other instead of hanging loosely or bouncing.
- Only rolling one direction — rolling consistently only to one side, or not at all by 5 to 6 months, especially if one side does not seem to participate.
- No social smile by 8 to 10 weeks — not specific to CP, but a general developmental flag worth mentioning to a doctor.
Signs in older babies at 6 to 12 months
- Not sitting without support by 9 months — most babies sit alone around 7 to 8 months. If yours still cannot balance unsupported by 9 months, that is a meaningful delay.
- Not putting weight on their legs — by 7 to 8 months, most babies enjoy standing when held and push down with their legs. Refusing to bear weight at all, or legs buckling completely, is a concern.
- Always using only one hand — consistently reaching with only the right hand, or only the left, while the other stays fisted or hangs unused. True hand dominance should not appear before 12 to 18 months — early one-sided use usually means the other side is not working well.
- Not babbling by 9 months — speech and movement often develop together. Absent babbling alongside motor delays adds to concern.
- Old reflexes still very strong — the startle reflex and grip reflex should fade by 4 to 6 months. If they remain very prominent at 9 months, it can mean the brain injury is interfering with normal development.
Signs in toddlers at 12 to 24 months
- Not walking by 18 months — 18 months is the outer edge of the typical window. A child not walking by then should be seen by a doctor, even if other development seems broadly okay.
- Always walking on tiptoes — occasional tiptoe walking is normal for new walkers. Always walking on tiptoes after 24 months, with calf muscles that feel tight, is a hallmark sign of spastic CP in the lower legs.
- Legs crossing when walking — the scissor gait, where one or both legs cross with each step, caused by tight muscles in the inner thighs.
- Persistently bent knees — walking with knees that never straighten properly, due to tight hamstrings and hip muscles pulling them into a crouched position.
- One side clearly weaker or stiffer — only swinging one arm when walking, dragging one foot, or using only one hand while ignoring the other completely.
- Falls far more than other children the same age — poor balance and coordination that is excessive compared to peers.
Signs that need urgent attention — at any age
The signs above are things to watch and raise at your next appointment. The signs below are different — these should prompt you to contact your doctor this week, not at the next routine check.
- Your child loses a skill they already had. A baby who was rolling and stops. A toddler who was walking and starts crawling again. Losing acquired skills is never just a phase — it always warrants urgent assessment. This is also not typical of cerebral palsy, which is non-progressive; loss of skills may point to a different neurological condition entirely.
- A seizure of any kind. Seizures occur in around 30 to 50% of children with CP. Any seizure in a baby or young child needs immediate medical evaluation.
- Clear asymmetry that is consistently getting more pronounced — one side of the body that is noticeably and increasingly less active, with no injury to explain it.
- Recurrent choking, coughing during feeds, or repeated chest infections. This can signal that food or liquid is entering the airways (aspiration), which is associated with CP affecting the muscles of swallowing.
- No visual response by 2 to 3 months — not tracking a face, not reacting to movement or light. Visual impairment is more common in some forms of CP and needs assessment.
Is it slow development — or could it be cerebral palsy?
This is probably the question you’re really asking. The honest answer is: you usually cannot know for certain on your own. But here is what is useful to understand.
What developmental delay actually means
A child with a developmental delay is working toward the same skills as other children — just more slowly. Many catch up fully with time and support. Delay can have many causes: being born early, nutritional factors, hearing differences, or just individual variation. Being slower than average on its own is not a diagnosis of CP.
How cerebral palsy is different
CP is not simply slow development. It involves a persistent change in how the muscles work — consistently too tight, too loose, or moving in unusual patterns — caused by a brain injury. The features that distinguish CP from general delay are:
- Muscle tone that is clearly abnormal — not just a slow starter, but muscles that are consistently stiff (spastic) or consistently floppy
- Movement that looks qualitatively different — not just slow to walk, but walking on tiptoes or with legs crossing
- Infant reflexes that persist beyond the expected ages — the startle reflex and other newborn reflexes normally fade by 4 to 6 months; when they remain prominent after this, it suggests the brain injury is affecting normal development
- A known risk factor — premature birth before 32 weeks, a difficult or emergency delivery, a period of oxygen loss around birth, or a brain abnormality already found on a scan
- Asymmetry that does not resolve — one side of the body that consistently behaves differently from the other, without any injury to explain it
The most important thing: You do not need to have figured out which of these it is before you start therapy. Whether the eventual diagnosis turns out to be CP, a general developmental delay, or something else entirely — early physiotherapy helps in every case. Uncertainty about the diagnosis should never be the reason you wait to start treatment.
What to do when something feels wrong
Your instincts matter. If something about your child’s movement has been nagging at you — trust it enough to act. Here is exactly how.
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Record short videos on your phone — right now This one step will make every doctor’s appointment far more productive. Capture the specific thing that worries you: the hand that stays fisted, the legs that stiffen when held upright, the unusual way they roll or walk. A 20-second clip is worth more than any verbal description you could give — and unlike a description, a video is the same every time anyone watches it.
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Raise your concerns specifically, not generally Do not just say “he seems a bit slow.” Say: “She consistently keeps her right hand clenched and never reaches with it — I have noticed this since she was 3 months old, and I have videos.” A specific, documented concern gets a specific, useful response.
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Ask for a referral to a paediatric neurologist Your GP or general paediatrician is a good starting point, but assessing movement disorders in infancy is a specialist skill. Ask for a specialist referral. If you are told to “wait and see” but your concern feels genuine, push back — or seek a second opinion.
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Start physiotherapy now — without waiting Physiotherapy — particularly massage in babies under two — is safe, beneficial, and appropriate for any infant with motor concerns, whether or not the cause is yet confirmed. Do not wait months for a diagnosis before beginning. The first two years are the most valuable time for this kind of intervention.
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Plan for the 24-month milestone if spasticity is confirmed If your child’s physiotherapist or neurologist confirms that their muscle tone is consistently too high (spasticity), mark their second birthday as a key date. From 24 months, minimally invasive surgical treatment like SFDM surgery becomes available and can produce functional improvements that physiotherapy alone cannot achieve. The earlier after age two, the better.
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Request a free remote evaluation →Frequently asked questions
What are the first signs of cerebral palsy in a newborn?
The earliest signs in a newborn include unusual floppiness (the baby feels limp when picked up), arms or legs that feel very rigid, difficulty feeding or latching, an arched back during crying, and jerky or trembling limb movements. Some babies with CP show no obvious signs at birth — signs often become clearer between 3 and 6 months when expected developmental milestones are not reached.
At what age is cerebral palsy usually first noticed?
Most parents first notice something different around 3 to 6 months, when babies are expected to hold their heads up, reach for objects, and start rolling. A formal diagnosis is usually confirmed between 12 and 24 months, when it becomes clear that major milestones like sitting, standing, or walking are significantly delayed. In milder cases, the diagnosis can come as late as age 3 or 4.
Is toe-walking always a sign of cerebral palsy?
Toe-walking alone is common and generally normal up to around 24 to 30 months. If your child consistently walks on tiptoes after that age — especially if their calf muscles feel tight, or if they also have stiff arms or poor balance — that warrants a medical assessment. In children with spastic CP, toe-walking happens because tight calf muscles prevent the heel from reaching the floor during walking.
What is the difference between developmental delay and cerebral palsy?
A developmental delay means a child is reaching milestones more slowly than average. Many children with delays catch up fully. CP is different because it involves a persistent change in how muscles work — consistently too stiff, too loose, or moving in unusual patterns — caused by a brain injury. The distinguishing features are abnormal muscle tone, qualitatively unusual movement, and infant reflexes that persist well beyond the expected ages.
What should I do if I suspect my baby has cerebral palsy?
Record short videos on your phone of the movements that concern you. Raise those specific concerns with your paediatrician and ask for a referral to a paediatric neurologist. Start physiotherapy now, without waiting for a formal diagnosis — early therapy produces better outcomes regardless of the eventual cause. If spasticity is confirmed, plan a specialist surgical assessment at 24 months.
Can cerebral palsy get worse over time?
The brain injury that causes CP is permanent and non-progressive — it does not worsen over time. But the effects on muscles and joints can worsen without treatment, especially during growth spurts. Tight muscles pull on growing bones, leading to permanent joint stiffness, hip displacement, and scoliosis. Early treatment prevents these secondary complications from developing in the first place.
When can surgery be done for cerebral palsy spasticity?
Surgical treatment for spasticity — such as the minimally invasive SFDM procedure at the CP Clinic — can begin from 24 months of age. This is the earliest point at which spasticity has fully established itself and surgery produces meaningful results. The earlier surgery is performed after age two, the better, because younger children respond more fully to post-operative rehabilitation.
Does every baby with cerebral palsy show obvious signs early?
Not always. In milder forms, particularly spastic hemiplegia where just one side of the body is affected, a baby may seem broadly typical for much of the first year. The most telling early clue is a consistent preference for one hand before 12 months — true hand dominance does not develop this early, so early one-sided preference usually means the other side is not working well. In more severe forms, poor muscle tone and missed milestones are typically noticeable within the first few months.
References
- Novak I, et al. (2017). “Early, Accurate Diagnosis and Early Intervention in Cerebral Palsy.” JAMA Pediatrics. PubMed ↗
- Einspieler C, et al. (2016). “The General Movement Assessment helps identify preterm infants at risk.” Frontiers in Psychology. PubMed ↗
- Rosenbaum P, et al. (2007). “The definition and classification of cerebral palsy.” Developmental Medicine & Child Neurology. PubMed ↗
- Novak I, et al. (2020). “State of the Evidence Traffic Lights 2019.” Current Neurology and Neuroscience Reports. PubMed ↗
- Morgan C, et al. (2016). “Early intervention for children aged 0-2 years with or at high risk of cerebral palsy.” Developmental Medicine & Child Neurology. PubMed ↗