Discover the Moro reflex, this archaic reflex that protects your baby in case of a fall. Learn how it influences their development and the impacts of an unintegrated Moro.
Published on October 30, 2025
The Moro reflex is an archaic protective reflex triggered in babies in response to a sensation of falling, preparing the nervous system to react to danger.
The Moro reflex appears at birth. When a baby feels a loss of stability, they react by suddenly opening their arms, fingers spread, and then closing them in a folding motion. This archaic reflex serves as a defense and alert mechanism. It should disappear around 4 to 6 months. However, if it persists, it can cause hypersensitivity, sleep disorders, anxiety, or difficulties in concentration in children... and even in adults.
The Moro reflex, also known as the archaic Moro reflex or baby Moro reflex, is an automatic response present from birth. It is triggered in response to a sensation of falling, a sudden stimulation of the vestibular system.
The baby opens their arms wide.
Their fingers spread apart.
Then they close their arms as if to grasp something.
They may cry in the seconds that follow.
This reflex is an evolutionary remnant, as if the infant is trying to cling to their mother or alert the environment to an imminent danger.
In typical development, the Moro reflex is present from birth and naturally extinguishes around 4 to 6 months as the central nervous system matures and emotional regulation sets in.
The Moro reflex is controlled by the brainstem, closely linked to the vestibular system (balance), the limbic system (emotions), and the autonomic nervous system (stress response).
It is activated by a sudden change in position (vestibular activation),
triggering an archaic motor response, coupled with a discharge of the sympathetic system (adrenaline). It prepares the body to react with flight, alertness, or calling for help.
The correct integration of the Moro reflex is a key step in developing emotional security, sensory tolerance, and self-regulation.
A Moro reflex persisting beyond 6 months (and even more so in school-aged children or adults) can generate:
Hyperreactivity to stress (excessive surprise, jumping at any noise).
Hypersensitivity (to sounds, lights, clothing, movement).
Difficulties adapting to new environments or managing change.
Generalized anxiety, excessive fears, social withdrawal.
Chronic restlessness or nervousness.
Difficulties filtering stimuli (noise in class, ambiance of an open space...).
Learning difficulties: the child is constantly on alert, struggling to concentrate.
Sleep disorders: difficulty falling asleep, nighttime awakenings.
Intense emotional reactions: sudden anger, fear, or crying.
Hypersensitivity: to sounds, lights, or touch.
Feeling of living “under pressure”.
Difficulties with emotional management, disproportionate reactions.
Chronic fatigue due to constant vigilance.
Tendency to avoid certain social or unexpected situations.
A slight loss of balance can be simulated (in a safe setting) or postural and sensory tests can be used to detect a persistent archaic response.
The child frequently startles without apparent reason.
They cannot tolerate transitions or new experiences.
They cry often “without visible cause”.
They seem to be in a state of almost constant stress.
In adults, this reflex manifests more as mental hyper-vigilance than motor reactions, but it remains observable in posture, muscle tone, or stress management.
The Moro reflex is often associated with other primitive reflexes that reinforce or compensate for its effects:
🔄 Galant Reflex : in cases of agitation or associated enuresis.
👁️ Asymmetrical Tonic Neck Reflex (ATNR): if motor disorders affect coordination.
🪞 Symmetrical Tonic Neck Reflex (STNR): if posture or balance issues are associated.
These reflexes form a functional network: the integration of one can facilitate that of the others, or reveal motor or emotional compensations.
The Moro reflex is much more than just a retraction. It is an archaic survival program, essential at birth but potentially overwhelming if it remains active. If not integrated, it can interfere with adaptation abilities, concentration, sleep, or relationships with others.
Fortunately, gentle and progressive approaches can help integrate it at any age.
Assessment by a movement professional (psychomotrician, occupational therapist, physiotherapist, sports coach…) and regular exercises allow the affected child or adult to regain more inner security, calm, and control over their emotions.
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