Study: Babies Start Deceiving as Early as 8 Months

Is childhood deception a sign of healthy development or a troubling behavior that parents should worry about?
Study: Babies Start Deceiving as Early as 8 Months
Above: German toddlers in the "Frogs" group engaged in play with building blocks at Spreekita Kindergarten in Berlin on May 3, 2007. Image credit: John MacDougall/AFP/Getty Images

The Spin


Narrative A

Babies are sneakier than anyone thought — research shows kids as young as 8 months old are already pulling deceptive moves, and by 17 months, half of all children are in on the game. This isn't some rare behavioral quirk; once kids start deceiving, over half do something sneaky within a single day. Deception is a normal, even healthy, part of child development that signals growing social awareness and brain development.

Narrative B

Early deception in babies isn't a moral failing — it's pure instinct driven by outcomes, not ethics, and parents who panic are missing the point entirely. Kids aren't calculating liars; they're sharp observers learning from their environment, including the small social fibs adults model every day. The real takeaway is that calm, consistent guidance during this phase builds a foundation for genuine honesty rather than just rule-following.

© 2026 Improve the News Foundation. All rights reserved.Version 7.1.0

© 2026 Improve the News Foundation.

All rights reserved.

Version 7.1.0