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Why Kids Lie (and What to Do About It)

Posted on July 20, 2026 · by Lucas dos Reis Arieme

Why Kids Lie (and What to Do About It)Capa do livro Dogavios: Where Dreams Come to Life

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You catch your child red-handed, literally, chocolate still on their face, and they still insist, «it wasn't me.» Your first instinct might be to worry you're raising a liar. Take a breath: lying is actually a developmental milestone, and understanding why it happens is the first step to handling it without drama.

Why kids lie at each age

Between ages 2 and 3, children don't fully separate fantasy from reality yet, «the dog ate the cookie» can feel almost like a genuine belief. Between 4 and 6, more «strategic» lying appears: your child now understands you can't read their mind, and tests that discovery to avoid trouble or get something they want. From around age 7, lies get more elaborate, often tied to a fear of disappointing parents.

What NOT to do

Yelling, calling your child a «liar,» or handing out harsh punishments usually backfires: kids learn that lying well is how you avoid serious consequences, so they just get sneakier, not more honest.

A calm script that works

  • Skip the trap question. Instead of «did you break the vase?» (when you already know), try: «I saw the vase is broken. Can you tell me what happened?»
  • Separate the act from the identity. Say «that wasn't true» rather than «you're a liar.» The identity we reinforce tends to stick.
  • Praise honesty out loud, immediately. When your child tells the truth about something hard, thank them first: «Thank you for telling me, that took courage», before addressing the consequence.
  • Keep consequences predictable and mild, tied to the act itself (helping clean up, say), never to the lying.

Stories teach better than lectures

Young children absorb values far more easily through stories than speeches. Shared reading time, like following the adventures of Pigúiça, the little husky of the Magical Garden, who messes up, learns, and tells her friends the truth, gives kids a safe mirror to think about honesty without feeling judged.

When to get professional support

Occasional lying is a normal part of growing up. If it's paired with constant aggression, stays frequent well past age 8-9, or is causing real distress at home, it's worth talking to your pediatrician or a child psychologist, they can look at the fuller picture better than any article can.

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Lucas dos Reis Arieme

Author of the Dogavios series

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