Infants as young as ten months old demonstrate basic forms of deception, according to a new study analyzing parental reports from over 750 families in the UK, US, Australia, and Canada. This means that long before children develop advanced language skills, they’re already learning how to mislead, hide, and get away with things.
The Study’s Findings
Researchers led by Elena Hoicka at the University of Bristol interviewed parents about their children’s deceptive behaviors. Roughly 25% of babies aged ten months were observed engaging in rudimentary deceit, like pretending not to hear instructions, concealing toys, or sneaking snacks when unobserved. By age three, this behavior becomes more sophisticated, with children fabricating stories, exaggerating events, and strategically withholding information.
This isn’t just anecdotal evidence. The study found that half of children identified as “deceivers” had acted sneakily within the past day, highlighting how quickly this behavior escalates. Tactics include feigning ignorance (“pretending not to hear ‘time to tidy up'”) or outright denial (eating chocolate then claiming innocence).
Why This Matters: Deception is Rooted in Biology
This research suggests that deception isn’t a late-stage cognitive development. It’s a behavior seen across species – chimpanzees hide food from rivals, and birds use false alarm calls to steal meals. The study builds on these observations to show that deception evolves gradually in human children, rather than appearing suddenly.
Hoicka explains that early forms of deception aren’t necessarily “all-out” lying, but rather strategic attempts to secure treats or avoid consequences. The progression from simple hiding to complex fabrication indicates an increasing understanding of how others think and perceive reality.
The Implications for Parents and Educators
The study’s authors propose that understanding these developmental stages can help caregivers stay ahead of their children’s “wily” behavior. Rather than being a sign of misbehavior, early deception is a normal part of cognitive growth.
Jennifer Saul, a co-author from the University of Waterloo, notes that philosophers have historically focused on adult deception while overlooking the nuances of childhood lying. This research offers a valuable counterpoint, showing that deception is far more complex and deeply ingrained than previously understood.
The findings, published in Cognitive Development, suggest that lying is not a moral failing in toddlers, but a natural extension of their learning process.
