Primitive reflexes are the foundation of a baby’s early movement and neurological development. These automatic, instinctual movements emerge in utero and help newborns survive, grow, and develop the necessary motor skills for later voluntary movement. While they play a crucial role in early life, primitive reflexes should gradually integrate as the brain matures. But what happens when they don’t? Let’s explore the role of primitive reflexes, why they are important, and what it means if they persist beyond infancy.
What Are Primitive Reflexes?
Primitive reflexes are involuntary movements controlled by the brainstem. They emerge during foetal development and are present at birth, helping babies with basic survival functions such as feeding, grasping, and responding to stimuli. As the brain matures, higher brain centres take over, and these reflexes should naturally integrate, or fade away, making room for more purposeful and voluntary movement.
Some key primitive reflexes include:
- Moro Reflex – Also known as the startle reflex, this response causes a baby to fling their arms outward and then retract them when startled.
- Rooting Reflex – A newborn turns their head toward a touch on their cheek, helping them find the breast or bottle for feeding.
- Palmar Grasp Reflex – When an object touches a baby’s palm, they instinctively grip it tightly.
- ATNR (Asymmetrical Tonic Neck Reflex) – Often called the “fencer’s pose,” this reflex involves a baby turning their head to one side, causing the arm on that side to straighten while the opposite arm bends.
- Spinal Galant Reflex – When the side of a baby’s lower back is stroked, they instinctively curve toward that side.
Why Are Primitive Reflexes Important?
From the moment a baby is born (and even before), these reflexes ensure their survival and early development by:
- Aiding in feeding and digestion (rooting and sucking reflexes)
- Encouraging movement and muscle tone development
- Supporting head and neck control, which is essential for later milestones like rolling, crawling, and walking
- Stimulating brain and sensory integration, laying the foundation for cognitive, motor, and social development
These reflexes act as stepping stones, helping the nervous system develop properly before being replaced by more refined, voluntary movements.
How Do Primitive Reflexes Disappear?
As a baby’s brain matures, the higher brain centres begin taking over movement control, integrating primitive reflexes into more complex motor and cognitive skills. This process, called reflex integration, typically occurs within the first 12 months of life.
For example:
- The Moro reflex disappears around 4-6 months as a baby gains better head control and voluntary arm movements.
- The Palmar grasp reflex fades around 3-6 months as babies learn to open and close their hands voluntarily.
- The ATNR reflex integrates by 6-7 months, allowing for balanced, symmetrical movement, which is crucial for crawling.
The disappearance of these reflexes signals a healthy, developing nervous system and prepares a child for more advanced motor functions like crawling, standing, and walking.
What Happens If Primitive Reflexes Don’t Integrate?
When primitive reflexes persist beyond their typical integration period, it can indicate neurological immaturity or developmental delays. Retained reflexes may contribute to challenges such as:
- Poor coordination and balance – Difficulty with activities like riding a bike or walking smoothly
- Difficulty with fine motor skills – Issues with handwriting, cutting with scissors, or buttoning clothes
- Sensory processing difficulties – Over- or under-reactivity to sensory input (e.g., sensitivity to loud noises or trouble with spatial awareness)
- Attention and learning challenges – Trouble focusing in school, dyslexia-like symptoms, or difficulty following instructions
- Emotional regulation issues – Heightened fight-or-flight responses, anxiety, or difficulty with social interactions
What Can Be Done About Retained Reflexes?
If primitive reflexes persist beyond infancy, targeted exercises and therapies can help reintegrate them. This might include:
- Neurodevelopmental movement exercises – Specific activities designed to mimic infant movements that stimulate brain development
- Sensory integration therapy – Helping the brain process sensory input more effectively
- Chiropractic and functional neurology approaches – Techniques that support nervous system development and reflex integration
Early identification and intervention can make a significant difference in helping children overcome challenges linked to retained reflexes.
HOW BRAIN HUB KIDS CAN HELP
Primitive reflexes are a critical part of early brain and motor development, ensuring babies gain the essential skills they need for growth and learning. While they typically integrate within the first year of life, retained reflexes can impact movement, learning, and behaviour. Recognising the signs and addressing any lingering reflexes can help set the stage for better coordination, focus, and overall development.
If you’re curious about reflex integration or suspect your child may have retained reflexes, book a Get Started call with Dr Carlo Rinaudo today! Our team specialises in neurodevelopmental approaches to help individuals reach their full potential.