Neuroplasticity in Early Childhood: How the Brain Transforms by Age Six

A child points to a dog on the street, looks at the adult and waits for a response. The adult smiles, names the animal, imitates its sound and asks where it is going. In just a few seconds, there was shared attention, language, emotion, memory and bonding. The scene seems simple — and it really should be simple — but experiences like this participate daily in the organization of a child's brain.

It is in this daily life, more than in schedules full of “stimulating” activities, that neuroplasticity finds nourishment. The child's brain changes as the child talks, plays, repeats, makes mistakes, experiments with movements and receives responses from those who care for them.

In our first article, “Neuroplasticity: How the brain adapts and learns”, we explain the general mechanisms of brain plasticity and its relationship with lifelong learning. Now, the focus is on a specific stage: what makes neuroplasticity so intense in early childhood and what does this change, in practice, until approximately the age of six?

What is neuroplasticity in childhood?

Neuroplasticity is the ability of the nervous system to change the strength of its connections, reorganize circuits and adapt its functioning in response to experiences. It does not only occur after an injury nor is it limited to school learning. It is present when the child distinguishes sounds of the language, coordinates steps, learns to wait, expands vocabulary or finds ways to solve a problem.

In the first years of life, connections form at a very fast pace. At the same time, the brain strengthens frequently used circuits and progressively reduces poorly mobilized connections through a process known as synaptic pruning. This does not simply mean “gaining” or “losing” neurons. It is about making networks more specialized and efficient, in interaction with biological maturation and lived experiences (KOLB; HARKER; GIBB, 2017).

Intense myelination also occurs, which increases the efficiency of the transmission of nerve impulses. Synaptogenesis, pruning, myelination and functional specialization follow different rhythms. The sensory, motor, linguistic, emotional and executive systems have their own trajectories.

Why is there so much talk about the first six years?

The expression “up to age six” is useful in highlighting the speed and sensitivity of development in early childhood, but should not be interpreted as an exact biological line. The brain doesn't end an entire phase on the eve of your sixth birthday.

Neuroscience works with sensitive periods: intervals in which certain experiences especially influence some circuits. Vision, perception of speech sounds, language, motor control and emotional regulation do not have a single common window, but periods with different times and degrees of opening (KNUDSEN, 2004; FOX; LEVITT; NELSON, 2010).

The first years offer unique opportunities, but not everything is decided at age six. Neuroplasticity remains in childhood, adolescence and adulthood. Further learning may require other paths or greater effort, but it remains possible.

This distinction protects families from two extremes: neglect based on the idea that “the child will learn alone when he grows up” and the anxiety of trying to teach everything before a supposed window closes.

Neuroplasticity needs relationship, not just stimulation

When a baby babbles and someone responds or a child shows a drawing and finds interest, a reciprocal exchange takes place. O Center on the Developing Child, from Harvard University, calls these responsive interactions serve and return: the child emits a signal and the adult perceives it, responds and supports the exchange.

These exchanges promote communication, attention, emotional security and social skills. The World Health Organization also situates development in integrated conditions: health, nutrition, protection, security, responsive care and learning opportunities from birth (WHO, 2020).

Instead of asking “which toy makes the child smarter?”, it is worth thinking about how the adult participates in the experience. A simple object can generate exploration, language and imagination; a sophisticated resource, used passively, can offer much less.

What favors neuroplasticity in everyday life?

There is no single activity capable of enhancing the entire brain. Childhood neuroplasticity is favored by varied, repeated, meaningful and developmentally appropriate experiences. Some practices have special value:

• Chat and respond: Naming objects, singing, telling stories and listening to attempts at communication expand linguistic opportunities. There is no need to turn each conversation into a class: even before speaking, gestures, looks and vocalizations already participate in the dialogue.
• Play with freedom and presence: When playing, children test hypotheses, negotiate rules, coordinate movements and face small frustrations. The adult can observe, ask questions and add possibilities without controlling all the steps, allowing her to also lead the experience (YOGMAN et al., 2018).
• Allow movement and exploration: Climbing, running, balancing, fitting, stacking and drawing integrate perception and action. Movement does not interrupt cognitive development: it helps to understand the body, space, cause and effect relationships and environmental limits (see our article on “The importance of playing in a child’s psychomotor development”).
• Protect sleep and predictability: Sleep participates in the consolidation of learning and the regulation of the organism. Predictable routines reduce unexpected changes. This does not mean rigidity, but an environment in which the child can anticipate part of what will happen and explore safely.
• Repeat without mechanizing: The child asks for the same story, repeats a game or tries a movement several times. Repetition strengthens circuits; small variations increase flexibility. Rereading a book and then anticipating the story or relating it to a real experience combines stability and novelty.

More stimulation does not mean more healthy neuroplasticity

When parents and educators discover the intensity of neuroplasticity in early childhood, it is understandable that they want to “enjoy every minute.” The problem arises when this intention turns childhood into ongoing training (we address these risks in detail in “The Danger of Hyperstimulation: Why Children Need to Play and Get Messy”).

Sequential classes, early collection and little time to play do not guarantee more efficient neural networks. They can generate tiredness, irritability and rejection of activity. The brain learns through the combination of attention, meaning, repetition, bonding, rest and participation, not through the isolated quantity of stimuli. Furthermore, excessive use of screens harms these fundamental exchanges (check out “Screens and Child Development: The Healthy Limit and Warning Signs”).

Even moderate boredom can open up space to create a game and organize an idea. It is not necessary to eliminate every empty interval: presence and time can be more fertile than another task.

What about when the child experiences stress or has difficulties?

Neuroplasticity also involves adaptation to the environment. Intense and prolonged stress, without protective relationships, can keep response systems excessively activated and interfere with attention, learning and emotional regulation. A difficult experience, however, does not inevitably determine the future: stable relationships and timely interventions can favor new trajectories.

Delay or difficulty does not mean a lack of neuroplasticity. There are differences in rhythm, neurodevelopmental conditions and sensory, emotional, pedagogical or social barriers. Observation must consider history, context and global functioning, avoiding rushed diagnosis and indefinite waiting.

In psychopedagogical intervention, understanding neuroplasticity helps to plan graduated, meaningful and systematic experiences. The goal is not to “normalize the brain”, but to find pathways for participation, learning and strategy development. Contextualized advances tend to be more consistent than intensive activities that are disconnected from reality.

What can family and school do until the age of six?

At home and in early childhood education, some simple decisions help transform scientific knowledge into practice:

1. Respond to the child's gestures, questions, looks and attempts at communication.
2. Set aside time every day to play without turning the activity into an assessment.
3. Read stories, talk about the images and allow the child to anticipate, retell or invent parts.
4. Provide adequate and safe motor experiences, inside and outside closed environments.
5. Maintain sleep, eating and transition routines with as much predictability as possible.
6. Propose challenges a little beyond what the child already accomplishes, offering enough help for them to participate.
7. Value the attempt, the strategy and the discovery, not just the success or the final product.
8. Observe persistent changes in development and record concrete situations to discuss with the school and professionals when necessary.

These actions do not require perfection. Neuroplasticity is built on a set of experiences, not on a single conversation, play or parental decision. What matters is the sufficiently stable presence of opportunities to explore, communicate, move, rest and establish secure relationships.

"Neuroplasticity reminds us that the brain transforms with experience. The quality of this experience is born less from excess and more from relationship: someone sees the child, listens to their initiative and participates with them in building new ways to learn."

Conclusion: the first years matter, but they do not imprison the future

Understanding neuroplasticity in early childhood should not be rushed; it must produce calm responsibility. Until the age of six, the brain goes through a period of enormous transformation and sensitivity to experiences. This condition makes care, early childhood education, playing and human relationships particularly relevant.

At the same time, no childhood is a project that needs to be completed before entering elementary school. The development remains open, although its conditions change over time. The child does not need a routine designed to “speed up the brain”. He needs experiences that make sense, adults who respond to his signals, space to repeat and discover, and support when the journey becomes difficult.

References

CENTER ON THE DEVELOPING CHILD AT HARVARD UNIVERSITY. Brain Architecture. Cambridge, MA, 2026. Available at: <https://developingchild.harvard.edu/key-concept/brain-architecture/>. Accessed on: 1 Aug. 2026.

FOX, Sharon E.; LEVITT, Pat; NELSON III, Charles A. How the timing and quality of early experiences influence the development of brain architecture. Child Development, v. 81, no. 1, p. 28–40, 2010. DOI: 10.1111/j.1467-8624.2009.01380.x.

KNUDSEN, Eric I. Sensitive periods in the development of the brain and behavior. Journal of Cognitive Neuroscience, v. 16, no. 8, p. 1412–1425, 2004. DOI: 10.1162/0898929042304796.

KOLB, Bryan; HARKER, Aaron; GIBB, Robbin. Principles of plasticity in the developing brain. Developmental Medicine & Child Neurology, v. 59, no. 12, p. 1218–1223, 2017. DOI: 10.1111/dmcn.13546.

WORLD HEALTH ORGANIZATION. Improving early childhood development: WHO guideline. Geneva: WHO, 2020. Available at: <https://www.who.int/publications/i/item/97892400020986>.

YOGMAN, Michael et al. The power of play: a pediatric role in enhancing development in young children. Pediatrics, v. 142, no. 3, e20182058, 2018. DOI: 10.1542/peds.2018-2058.