In a quiet laboratory, a three-month-old baby wears a cap of soft electrodes while a camera tracks every twitch of her limbs. A melody plays — a simple children’s tune, its notes falling in a predictable pattern. Her brain registers the structure instantly, electrical signals flaring in recognition. Then the researchers scramble the same notes into a random sequence, and the flare dims. The infant, a team from Rome and Vienna observed, can already tell music from noise. Yet her body does not know the difference. She kicks and squirms with equal intensity to both, unable to align movement to the beat. Only at twelve months, the study found, do children begin to move differently to real music, though even then they do not quite dance in time. The motor wiring, it seems, takes far longer to mature than the sensory one.

That gap — between what a young mind perceives and what it can physically or emotionally manage — sits at the centre of a sprawling, anxious conversation now unfolding far beyond the lab. From Karnataka to Copenhagen, governments are rushing to wall off childhood from the smartphone. India’s southern states have announced restrictions on children’s social media use, while the European Union is weighing a risk-based approach that would target harmful design features rather than entire platforms. A German advisory panel has proposed either a statutory minimum age of thirteen or curbs on specific services. In Brussels, officials speak of forcing platforms to prove they are safe before minors can use them, a logic that shifts the burden from the device in a child’s hand to the business model that keeps it glowing.

That business model is now so pervasive that it has begun to reshape the most intimate of bonds. A survey of six hundred American adolescents, published in Frontiers in Psychology, found that many felt ignored or marginalised when their parents were absorbed by their phones. Psychologists describe the phenomenon as “technoference”, and its consequences, they argue, can include insecure attachment patterns that persist for life. One clinician recalled a child telling him: “Every time I looked up, you were looking down at your device.” The parent, he said, had been present at every ballet rehearsal and softball practice, yet the child experienced a profound absence. Meanwhile, a Deloitte survey of American parents found half worried their children already relied too heavily on artificial intelligence, even as only a third said schools had set any guidelines for its use.

Beneath these policy debates and parental anxieties, a quieter body of evidence is accumulating about the very earliest years. A longitudinal study by French and Singaporean researchers, tracking five hundred children from infancy, linked high screen exposure before age two to later declines in academic performance and working memory. The infant brain, they noted, is in a phase of such rapid development that it is especially vulnerable to the loss of direct, real-world interaction. The findings echo a growing consensus among paediatric researchers in Britain and elsewhere that routine screen time for the under-twos carries long-term health and cognitive risks, though video calls with family are still considered an acceptable exception.

All of this leaves a curious image suspended in the mind: a twelve-month-old, finally beginning to move her body to a melody she has been hearing her whole short life, still unable to find the downbeat. Around her, the world is arguing about algorithms and age limits, about notifications and neural pathways. She does not yet know what a screen is. She is simply trying, with the ancient, unhurried machinery of her own development, to learn to dance.