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Study: Babies Start Deceiving as Early as 8 Months

Researchers found about 25% of infants show deception by 10 months and 50% by 17 months, with behaviors growing more complex by ages 2 to 3 years.

  • Researchers led by Elena Hoicka found some children begin attempting to deceive parents before their first birthdays, based on interviews with parents of 750 children.
  • About a quarter of children are deceptive by 10 months and half by 17 months, with deception becoming more elaborate by their third birthdays.
  • Younger infants commonly hide items or pretend not to hear, while two-year-olds deny eating sweets or hide things, often hiding under a table or in the bathroom and fabricating stories like 'a ghost ate the chocolate.'
  • Researchers say early lying is normal and hope the findings give parents and caregivers a development roadmap; Hoicka said, 'It was fascinating to uncover how children's understanding and usage of deception evolves from a surprisingly young age and builds in their first years so they become quite adept and cunning 'little liars',' in a news release.
  • The findings link early deception to developing working memory and representational thought, with Saul saying 'this study shows just how much complexity gets overlooked by that focus.
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21 Articles

Lean Left

Even before we can walk or talk, some babies would already be able to... fool their entourage, according to a new global study.

·Montreal, Canada
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Le Huffington PostLe Huffington Post
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Left

Under their adorable and innocent airs, babies understand very early what tricks and lies are, reveals a study.

·Paris, France
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Although babies can't yet walk or talk, they master the basics of deception before their first birthday, researchers in England and Canada find in a recent study.

·Estonia
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The Sun broke the news in United Kingdom on Sunday, March 15, 2026.
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