Critical Nutrients for Brain Development in Children

What is neurodevelopment?

Neurodevelopment is the process of building a child’s brain. Not just its size, but how it connects, communicates, and functions over time.

From pregnancy through early childhood, the brain is in a constant state of change. It grows rapidly, forming billions of connections between brain cells. These connections are not random. They are shaped by experience. Pathways that are used often become stronger and more efficient, while those that are not used are gradually pruned away.

This means the brain is not simply something a child is born with. It is something that is built, refined, and organised through daily life.

One of the most important drivers of this process is experience. Movement, touch, sound, vision, relationships, and exploration all provide input that helps the brain wire itself. Every time a child reaches, rolls, crawls, climbs, or interacts with the world, their brain is adapting. From the very beginning, the brain is organising itself around movement, balance, and spatial awareness. The physical world is not separate from brain development, it is the foundation of it.

What influences brain development?

Brain development does not happen in isolation. It is shaped by a combination of internal and external factors that either support or disrupt the process. Sleep plays a critical role, allowing the brain to consolidate learning, regulate emotions, and repair itself. Nutrition provides the raw materials required to build brain tissue and produce neurotransmitters. Movement drives the integration of sensory and motor pathways, strengthening connections that underpin coordination, attention, and behaviour. The environment, including stress, toxins, and sensory input, also has a profound impact on how the brain develops. These influences are not separate systems. They are deeply interconnected, each affecting the others in subtle and powerful ways.

The developing brain is energy-hungry

The early brain is extraordinary in both its growth and its demands. At birth, a baby’s brain makes up around ten percent of their body weight, yet it consumes up to sixty percent of the body’s energy. In the first year of life, the brain doubles in size. By the age of three, it has tripled. This is a period of intense construction. Cells are growing, connections are forming, and networks are being refined at a pace that will never be repeated. It is also a time when the brain is particularly sensitive to both support and disruption.

This is why nutrition in early life is so important.

The brain is not simply growing, it is being built, moment by moment, from the nutrients available to it.

The nutrients that build the brain

There are certain nutrients that play particularly important roles in neurodevelopment. These are not optional extras. They are fundamental to how the brain is structured and how it functions.

Omega-3 fatty acids, particularly DHA, are a major structural component of brain cell membranes. They influence how flexible and responsive those membranes are, which in turn affects how well brain cells communicate with one another. Adequate omega-3 intake supports learning, attention, and behaviour, while also helping to regulate inflammation within the brain.

Choline is another critical nutrient, often overlooked. It is required to produce acetylcholine, a neurotransmitter involved in memory, learning, and attention. It also contributes to the structure of cell membranes and plays an important role in early brain patterning, particularly during pregnancy and infancy.

Vitamin B12 and folate work together in a process known as methylation. This process is essential for DNA expression, repair, and the production of neurotransmitters. They supports detoxification pathways within the body. Disruptions in methylation can have wide-reaching effects on brain development and are commonly observed in children with neurodevelopmental challenges. Supplements of B12 and folate are not all made equal. Read more about folate here.

Magnesium acts as a regulator of the nervous system. It helps to balance excitatory and inhibitory signals in the brain, supporting calmness, sleep, and emotional regulation. In children who are easily overwhelmed, restless, or have difficulty sleeping, magnesium status is often an important consideration.

Zinc plays a dual role in both brain function and immune regulation, making it one of the most important minerals for a child’s overall development. It is involved in neurotransmitter activity, influencing how brain cells communicate, and plays a key role in appetite, taste perception, and food acceptance — something particularly relevant in children with selective eating patterns. Zinc helps regulate inflammation, supporting a more balanced and resilient immune response. Zinc also plays a critical role in the production of metallothionein, a protective protein that helps the body regulate essential minerals such as zinc and copper, bind and remove harmful metals, and protect cells from oxidative stress. Through this pathway, zinc supports detoxification processes, immune balance, and healthy brain function at a deeper, more foundational level.

Iron is essential for delivering oxygen to the brain and supporting energy production within brain cells. It is also required for the production of dopamine, a neurotransmitter involved in motivation, attention, and reward. Even mild iron deficiency can affect cognitive function, behaviour, and overall development.

Vitamin A has a profound influence on both the brain and the gut. It regulates gene expression during brain development, helping to guide how cells differentiate and function. It also supports the integrity of the gut lining and plays a key role in immune balance, including within the brain itself. Despite its importance, vitamin A insufficiency is more common than many people realise. Read more here.

What can interfere with brain development?

Just as certain nutrients support the brain, there are also some that can disrupt its development.

Excess sugar is one of the most common. It drives inflammation, alters gut bacteria, and can contribute to fluctuations in mood and behaviour. While occasional intake is unlikely to cause harm, regular high consumption can have cumulative effects on both the gut and the brain.

Artificial colours, flavours, and preservatives have also been associated with behavioural changes in some children. These substances can influence neurotransmitter systems and add to the overall chemical load the body must process. Read more here.

Gluten and dairy are more complex. They are not inherently harmful for every child, but in susceptible individuals, they can contribute to gut inflammation and alter the gut–brain connection. In these cases, they may influence digestion, behaviour, and overall neurological function. Removing these from the diet can have huge effects. Read more here.

The bigger picture

The brain is not just something a child is born with. It is something that is built through a dynamic interaction between biology and experience. Nutrition provides the building blocks. Movement and environment shape the wiring. Sleep supports integration and repair. Each of these factors matters on its own, but it is their interaction that ultimately determines how a child’s brain develops. For parents, this can feel overwhelming. But it can also be empowering. Because it means that small, consistent changes in daily life, what a child eats, how they move, how they sleep, and the environment around them, can have meaningful effects on how their brain grows and functions over time.

Your child’s brain is being built every day. Not just by genetics, but by what they eat, how they move, how they sleep, and the world they are growing up in. Parents have a huge influence on that.

Amanda Downsborough, BSc, PGDip, GCert, MSc, ACAAM,

Functional & Nutrigenomic Medicine Practitioner

Brain Kids – www.brainkids.com.au

About the Author

Amanda Downsborough, BSc, PGDip, GCert, MSc, ACAAM, is a Functional and Nutrigenomic Medicine Practitioner specialising in autism and child neurodevelopment. Through her practice, Brain Kids, Amanda combines functional medicine, genetics, and neuroscience to uncover the biochemical and environmental factors affecting children’s health. Her work empowers families with science-based strategies to support brain balance, behaviour, and lifelong wellbeing.

Disclaimer

This information is provided for educational purposes only and is not intended as a

substitute for medical advice, diagnosis, or treatment. Always seek the advice of a

qualified healthcare provider with any questions regarding a medical condition or before

making changes to your or your child’s care plan.