Awakening through play: what science now knows about toys for 0-3 year olds
By Anaïs Lebrun · April 9, 2026 · 14 min read
Three years. That's the length of a municipal presidency, a university master's degree, or a gym membership one never uses. But it is also, and above all, the most intense and critical period of human brain development. In just three years, a child transitions from total dependence to walking, language, symbolic thought, and self-awareness. A neurological feat unparalleled in the rest of existence.
And throughout this period, they play. Or rather—because the distinction is important—they explore. Because for a child under three, playing and learning are not two separate activities. They are two words for the same thing.
Consequently, the question of toys takes on a new dimension. It's no longer just a matter of entertainment or a birth gift. It's a matter of development. And science, over the past decades, has much to say on the subject.
A child's brain: a construction site ablaze
To understand the importance of toys in the early years, one must first understand what is happening in a baby's brain. And what is happening there is, simply put, quite spectacular.
At birth, the human brain has about one hundred billion neurons—as many as in an adult. But these neurons are still largely isolated from each other. What will happen during the first thirty-six months is the frantic formation of connections between these neurons—the synapses. At its peak, around the age of two, a child's brain forms approximately one million new synaptic connections per second. Per second.
But this proliferation is followed by an equally crucial process: synaptic pruning. The brain, in its evolutionary wisdom, eliminates connections it doesn't use and strengthens those it regularly engages. This principle—often summarized by the phrase "use it or lose it"—means, concretely, that the experiences a child has in their early years literally shape the architecture of their adult brain.
What the child touches, sees, hears, feels, manipulates, and explores during these years is therefore not insignificant. It is the material with which their brain builds itself. And toys, as privileged objects of exploration, play a central role in this process.
What research says about toys
Studies on the impact of toys on child development have multiplied since the 1990s, driven in particular by advances in brain imaging that now allow us to observe the brain in action in real time. The conclusions, sometimes counter-intuitive, are worth knowing.
Less stimulation, more learning
One of the most surprising—and most useful for parents—discoveries is that technologically sophisticated toys are not necessarily the most beneficial for development. A study published in 2015 in the journal JAMA Pediatrics compared the impact of different types of toys on the language development of children between ten and sixteen months. The result: electronic toys, with their sounds, lights, and recorded voices, produced significantly fewer verbal interactions between parents and children than books or traditional non-electronic toys. By capturing the child's attention, the electronic toy paradoxically reduced their learning opportunities.
This finding aligns with what neuropsychologists call the "child as actor" principle: the brain learns best when it is in a position to act on the world rather than passively receive it. A toy that does everything for the child leaves little room for them to build their own understanding.
The irreplaceable value of free play
Another strong conclusion from contemporary research concerns free play—that is, undirected play, without a predefined goal, where the child alone decides what they do and how. Researchers like Peter Gray, a psychologist at Boston University, have shown that free play is essential for the development of emotional self-regulation, creativity, and social skills—and that its progressive decline in children's schedules is directly correlated with the rise in anxiety and depressive disorders in young people.
The best toys for free play are those that offer the most possibilities with the fewest constraints. A stick, a cardboard box, a pile of sand—these loosely defined objects are rich in potential because the child can make them whatever they want. Conversely, a toy that can only be used in one way quickly exhausts its play potential.
The importance of touch
Research in sensory neuroscience has highlighted the crucial importance of touch in the cognitive development of young children. The skin is the body's largest sensory organ, and in infants, it is also one of the primary channels for exploring the world. Varied textures—smooth, rough, soft, grainy, firm, flexible—activate different areas of the brain and contribute to the construction of mental representations of objects.
This observation has direct implications for toy selection. A rattle that offers several different textures is preferable to a uniform rattle. A set of blocks combining smooth wood, fabric, and cellular plastic is sensorially richer than a single-material set. And the famous fabric books for babies, often considered mere gadgets, actually correspond to a solidly supported pedagogical intuition.
Month-by-month development: which toys for which stage?
Child development does not follow a straight line, and every child has their own pace. But there are major developmental windows that help guide toy choices appropriately.
0 to 3 months: the world comes into view
At this age, the infant is still largely limited in movement, but their senses are intensely awake. Vision is still blurry beyond twenty to thirty centimeters—the exact distance separating a baby's face held in arms from the face of the person holding them. This is no coincidence: the human face is the first and most important of all toys.
Mobiles, suspended above the crib, are perfectly suited to this stage. Black and white contrasts, which the young visual system processes more easily than pastel colors, capture attention and stimulate visual development. Soft, repetitive sounds—chimes, music boxes—begin to create the first associations between sound and movement.
4 to 6 months: the hand discovers the world
This is the age of the first voluntary grasps. The hand becomes an exploratory tool that the child learns to control with admirable concentration. Lightweight rattles, teething rings with varied textures, hanging activity toys that respond to kicks—anything that invites grasping, shaking, pulling, and pushing is perfectly suited.
The mouth remains a major organ of exploration at this age—as parents well know, consistently finding drooled-on toys on the sofa. This is not a phase to discourage: mouthing is a way for the child to obtain sensory information that their still-clumsy hand cannot yet collect as effectively. Therefore, material safety is an absolute priority.
7 to 12 months: exploring space
The acquisition of sitting, then crawling, then standing radically transforms the child's relationship with space. Their field of exploration expands considerably, and with it, their relationship with objects. This is the age of object permanence—the fascinating discovery that objects continue to exist even when they are no longer seen. The seemingly simple peek-aboo game is actually a fundamental exercise in understanding this permanence.
Cause-and-effect toys—pressing a button to hear a sound, pulling a string to see a character appear—are perfectly suited to this stage. Stacking and knocking down blocks, objects to slide into holes, balls of different sizes and textures—all are invitations to understand the elementary laws of physics through direct experimentation.
12 to 24 months: the explosion of the symbolic
The second year of life is marked by a major cognitive revolution: the emergence of symbolic thought. The child begins to understand that one object can represent another—that a banana can pretend to be a phone, a cushion can be a boat, a doll can be hungry. This is the beginning of "pretend" play, one of the most sophisticated forms of human mental activity.
Toys that support this development are those that open the door to representation: small animal or people figurines, miniature play kitchens, vehicles that travel in imaginary settings. Picture books also fall into this category—they allow the child to connect a two-dimensional representation with a real object or being.
Gross motor skills continue to develop rapidly at this age. Ride-on toys, walkers, appropriately sized climbing structures—anything that allows for running, climbing, pushing, pulling, and carrying corresponds to an intense physiological need and must absolutely be part of the play environment.
24 to 36 months: towards autonomy
The third year is one of self-assertion—sometimes with a bang, as any parent of a two-and-a-half-year-old painfully knows. It is also the age when fine motor skills make spectacular progress, language explodes, and the first social interactions with peers begin to have real meaning.
Simple puzzles, shape sorters, first constructions with blocks—anything that requires precision, planning, and perseverance corresponds to this stage. Parallel play, in which two children play side-by-side without truly playing together, foreshadows the cooperative games that will flourish in subsequent years.
The trap of overstimulation
The love that parents have for their children naturally pushes them to want to offer the best possible environment, the best opportunities, the best experiences. And in a society that values performance and optimization, this laudable intention can easily lead to overstimulation.
A child surrounded by too many toys, constantly exposed to varied stimuli, without ever having the opportunity to be bored, is a child deprived of an essential experience: that of endogenous generation. Boredom—that uncomfortable moment when there is nothing external to capture attention—forces the brain to turn to its own resources. It is in these moments that the richest imaginary games, the most inventive stories, the most personal discoveries are born.
Researchers like British psychologist Sandie Mann have shown that children who are regularly allowed to be bored develop significantly higher creativity than those whose time is constantly filled. A room overflowing with toys is not an enriching environment—it is an exhausting environment that disperses attention without ever allowing it time to focus.
Toy rotation—the principle of exposing only a portion of available toys at any given time, putting the rest away and reintroducing them later—is a simple and effective practice for maintaining interest without overstimulating.
What parents provide that no toy can replace
The most consistent conclusion of all research on early childhood development can be summarized in one sentence: the best toy in the world cannot replace a present, attentive, and engaged adult.
This is not an invitation to guilt. It is simply a reminder that human interaction is the substrate upon which everything else is built. A child who plays alone with the most sophisticated toy on the market learns infinitely less than a child who plays with an ordinary object in the company of an adult who comments, encourages, names, questions, and marvels with them.
The language that accompanies play is perhaps the most determining factor in early cognitive development. Naming colors, shapes, actions—"you're stacking the red cube on the blue cube, well done!"—is not an innocuous activity. It is literally the construction of the inner language with which the child will think throughout their life.
Playing with your child, truly playing, with curiosity and without distraction, is perhaps the most worthwhile parental investment there is. And it costs nothing.
Some principles for choosing without getting lost
Faced with the plethora of options and often confusing marketing messages, a few simple principles can help guide you.
Prefer open-ended to closed-ended. A toy that can be used in ten different ways is preferable to a toy that can only be used in one way, even if sophisticated. The richness of a toy is measured by the diversity of play it allows, not by its intrinsic features.
Prioritize quality over quantity. A few well-chosen toys, appropriate for the child's developmental stage and offering genuine opportunities for exploration, are better than an avalanche of objects that accumulate without really being used.
Trust the child. They know, better than any expert, what they need at any given moment. A child who systematically neglects a toy is trying to tell us something. A child who returns again and again to the same object, however modest, is also telling us something.
And above all, remember that the goal is not to produce a child who develops optimally according to all available indicators. The goal is to support a human being who explores the world with curiosity, confidence, and joy. The rest follows.
"What a child needs to thrive is not the best toy in the catalog. It's someone to play with them."
Anaïs Lebrun is a developmental psychologist and associate researcher at Université Paris Cité. She specializes in early interactions and the impact of the play environment on the cognitive development of young children.