What is the General Movement Assessment, in simple terms?

It's a way of checking a baby's brain and nerve health by watching how they move naturally, on video, for just a few minutes. Nobody touches or tests the baby. A trained observer simply watches the recording and looks at the quality of the baby's spontaneous movements. It was developed by a doctor named Heinz Prechtl and is now one of the most accurate early screening tools available for cerebral palsy.

Does a normal result mean my baby definitely won't have any developmental problems?

It means something specific and reassuring, but not everything. A normal fidgety movement pattern is strongly reassuring against cerebral palsy specifically. It doesn't guarantee that every other area of development, such as speech, learning, or general development, will unfold without any concerns, particularly in babies who faced other serious medical challenges around birth. This is exactly why the assessment is best used alongside ongoing check-ups, not as a single, final verdict.

Why isn't this test more widely known or used?

Largely because it requires specific training to score accurately, and that training hasn't spread evenly around the world. Awareness among general paediatricians also varies considerably by country and region. This is changing though: researchers are actively developing app-based and AI-assisted scoring tools designed to make the assessment easier to access, even in places without a locally trained specialist, which could meaningfully close this gap over time.

What happens if my baby's assessment shows a concerning result?

A concerning result isn't a final diagnosis of cerebral palsy on its own. It's a strong, evidence based signal to begin early intervention right away and to arrange closer developmental follow-up, often alongside other tools like brain imaging or a structured neurological exam. Starting therapy during this very early window, well before a definitive diagnosis is even possible, is exactly when a developing brain has the greatest capacity to build new pathways, which is why acting on this signal early matters so much.

The General Movement Assessment (GMA): The Test That Can Detect CP at 3 Months

Diagnosis & Early Detection 11 min read

The General Movement Assessment (GMA): The Test That Can Detect CP at 3 Months

Q: What are fidgety movements, and why do they matter so much?

Fidgety movements are small, gentle, flowing movements of the neck, trunk, and limbs that typically appear in a healthy baby between 3 and 5 months of age. They look elegant and varied, almost like a light, continuous dance. When these movements are missing entirely at this age, it's one of the strongest known early warning signs of cerebral palsy. In fact, in one large study, 95% of children later diagnosed with CP had shown no fidgety movements at this stage.

Q: How accurate is this test compared to just waiting and watching a baby's development?

Remarkably accurate. Across multiple studies, assessing fidgety movements correctly identified 95 to 100% of babies who later developed cerebral palsy, and correctly reassured 89 to 98% of babies who did not. In one study, babies with absent fidgety movements were about 21 times more likely to have an abnormal outcome, including CP, compared with babies who had normal fidgety movements. Different trained observers also tend to agree closely with each other when scoring the same video, which adds real confidence in the result.

Most families don’t hear the words “cerebral palsy” until well into their child’s second year, sometimes later. There’s a test that can flag real risk by 3 to 5 months, using nothing more than a few minutes of video. It’s remarkably accurate. And in most of the Arabic-speaking world, almost nobody has heard of it.

Written by CP Clinic Medical Team Tovmed Medical Center, Vinnytsia, Ukraine

Medically reviewed by Prof. Vigein Tovmasian PhD · Orthopedic Surgeon · Honorary Doctor of Ukraine

What this test actually is

The General Movement Assessment, often shortened to GMA, checks how well a baby’s brain and nerves are working. It does this in a very simple way: by watching how the baby moves on their own.

A short video is taken while the baby lies calmly, awake, not being touched or handled. A trained observer then watches that video and looks closely at the quality of the baby’s spontaneous movements. No needles. No machines. No discomfort for the baby at all.

This method was developed by a doctor named Heinz Prechtl. It’s based on something called Gestalt perception, which really just means a skilled observer’s trained overall impression of how the movements look, rather than measuring any single specific motion.

Two windows, and one that matters most

Birth to ~9 weeks

Writhing movements

The pattern typically seen in the first weeks of life. Useful, but not the most predictive window on its own.

3 to 5 months

Fidgety movements

Small, gentle, flowing movements of the neck, trunk, and limbs, almost like a light, continuous dance. This is the window with by far the strongest predictive power, and the one this article focuses on.

Two specific patterns reliably point toward cerebral palsy. The first is movements that look stiff and rigid, where muscles tense and release almost all at once instead of flowing smoothly. The second, and the one doctors watch for most closely, is simply the absence of fidgety movements altogether at the age they’re expected to appear.

How accurate this really is

This isn’t a rough guess. It’s one of the most accurate early screening tools in all of paediatric medicine.

95 to 100% of babies later diagnosed with CP were correctly flagged by the fidgety movement assessment

89 to 98% of babies who did not develop CP were correctly reassured

21.5× higher chance of an abnormal outcome, including CP, when fidgety movements were absent

0.88 to 0.92 agreement score between different trained observers watching the same video

In one detailed study, 95% of children later diagnosed with CP had shown no fidgety movements at this early stage. That’s an extraordinary hit rate for a test that costs nothing beyond a short video and a trained set of eyes.

What a normal result doesn’t tell you

Worth being clear about

A normal fidgety movement pattern is strongly reassuring specifically against cerebral palsy. It does not guarantee that every other area of development, speech, learning, general progress, will unfold with no concerns at all, especially for babies who faced other serious medical challenges around birth. In one study following babies who’d had major surgery as newborns, nearly half still showed some developmental delay at follow-up, even after a normal early GMA result.

This isn’t a reason to dismiss the test. It’s a reason to use it for exactly what it’s best at, flagging CP risk specifically, while still keeping up with regular developmental check-ups for everything else.

Why this isn’t more widely known yet

Mostly because scoring the videos accurately requires specific training, and that training hasn’t reached every country and every clinic equally. Awareness among general paediatricians also varies a great deal depending on where you are.

This is genuinely changing. Researchers are actively building app-based and AI-assisted tools designed to score these videos automatically, without needing a locally trained specialist on hand. Over time, this could make a test this accurate available almost anywhere a smartphone camera can reach.

What to do with this information

❓
Ask directly whether a GMA has been offered Particularly if your baby was premature, had a difficult birth, or spent time in intensive care, this is a reasonable, specific question to raise with your paediatrician.
📹
Ask about the 3 to 5 month fidgety window specifically This is the assessment window with the strongest evidence behind it, so timing genuinely matters here.
🚀
Treat a concerning result as a starting signal, not a final answer It’s a strong, evidence based reason to begin early intervention right away, exactly during the window when a developing brain has the greatest capacity to build new pathways.

The single biggest reason this test matters isn’t the accuracy number itself. It’s what that accuracy makes possible: starting real support for a baby’s development months before most families ever hear a diagnosis discussed at all.

Have questions about your baby’s development, or want guidance on what to ask for next?

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Frequently asked questions

What is the General Movement Assessment, simply put?

A way of checking a baby’s brain and nerve health by watching how they move naturally on a short video, without touching or testing them. A trained observer looks at the quality of the movements. Developed by Dr. Heinz Prechtl, it’s now one of the most accurate early screening tools for cerebral palsy.

What are fidgety movements, and why do they matter so much?

Small, gentle, flowing movements of the neck, trunk, and limbs typically appearing in healthy babies between 3 and 5 months. Their complete absence at this age is one of the strongest early warning signs of cerebral palsy; in one study, 95% of children later diagnosed with CP showed no fidgety movements at this stage.

How accurate is this compared to just watching a baby develop?

Very accurate. Studies show 95 to 100% of babies who later developed CP were correctly identified, and 89 to 98% of babies who did not were correctly reassured. Babies with absent fidgety movements were about 21 times more likely to have an abnormal outcome including CP. Different trained observers also agree closely with each other.

Does a normal result mean no developmental problems at all?

It’s strongly reassuring against cerebral palsy specifically, but doesn’t guarantee every area of development will unfold with no concerns, especially for babies who faced other serious medical challenges. It’s best used alongside regular developmental check-ups, not as a single final verdict.

Why isn’t this test more widely known?

Scoring requires specific training that hasn’t spread evenly worldwide, and awareness among general paediatricians varies by region. This is changing as researchers develop app-based and AI-assisted scoring tools to make the assessment accessible without a locally trained specialist.

What happens if my baby’s result is concerning?

It isn’t a final diagnosis on its own. It’s a strong, evidence based signal to begin early intervention right away and arrange closer follow-up, often alongside other tools like brain imaging. Starting therapy this early, well before a definitive diagnosis is possible, matters because this is when a developing brain has the greatest capacity to build new pathways.

References

Einspieler C, Bos AF, Krieber-Tomantschger M, et al. “Cerebral Palsy: Early Markers of Clinical Phenotype and Functional Outcome.” PMC. PMC ↗
“The Pooled Diagnostic Accuracy of Neuroimaging, General Movements, and Neurological Examination for Diagnosing Cerebral Palsy Early in High-Risk Infants: A Case Control Study.” PMC. PMC ↗
“Use of the General Movements Assessment for the Early Detection of Cerebral Palsy in Infants with Congenital Anomalies Requiring Surgery.” PMC. PMC ↗
“Prognostic value of the qualitative assessments of general movements in late-preterm infants.” PubMed. PubMed ↗
Einspieler C, Prechtl HF. (2005). “Prechtl’s assessment of general movements: a diagnostic tool for the functional assessment of the young nervous system.” PubMed. PubMed ↗
“General movement assessment: Predicting cerebral palsy in clinical practise.” ScienceDirect. ScienceDirect ↗

Medical disclaimer: This article is for informational purposes. The General Movement Assessment should be performed and interpreted by a trained professional as part of a broader developmental evaluation.