Why Children Lie (And What You Should Do About It)

May 31
5 min read

My Child Lies to Me. Constantly. About Completely Pointless Things.

Tell me if this sounds familiar:

Your child emerges triumphantly from the toilet. Happy as Larry that they made it in time, without incident. A parenting win. You almost feel proud.

They are halfway down the corridor, eyes already fixed on a toy they have every intention to touch, manipulate, and almost certainly fight their sibling over, when you intercept them.

"Did you wash your hands?"

"Yes."

"Let me smell them."

"BUT I ALREADY DID."

Tiny hands dart immediately behind their back. And there you stand.

You heard no water.

There is no faint waft of spring blossoms drifting down the hallway.

The soap dispenser has not moved.

You know. Oh yes. You know.

And yet your small person is looking you dead in the eye and confidently denying objective reality.

This is how you end up in a full-scale power struggle over soap.

It ends, as these things always do, in tears. Usually yours. And somewhere in the wreckage of it, a part of your brain is asking: why are you doing this to meeeee?

First of all: take a deep breath.

Your child is probably not a tiny psychopath in training.

In fact, lying in young children is actually a surprisingly normal - and even fascinating - part of development.

Wait... lying can be developmentally normal?

Yep.

Your Child is Lying Because Their Brain is Working

Lying is a developmental milestone, only possible once a child has developed self-control and the ability to understand that another person's mind contains something different from their own. Psychologists call this Theory of Mind. APA

To pull off a successful lie, a child has to:

hold the truth in their mind while suppressing the urge to blurt it out
predict what you might or might not know
deliver an alternative version of reality with a straight face

That is a lot of cognitive work for someone who still calls strawberries "strawbabies."

When a child starts to lie, it means they understand that people's beliefs do not directly reflect reality, but vary based on experience.

The hands disappearing behind their back? Your child's brain doing something genuinely new: realising that you cannot smell what you cannot smell, and deciding to test whether a story can override the evidence right in front of you. Substack

Breathtaking, really. Once you stop wanting to cry about it.

So When Does This Start?

Earlier than you think, and more universally than you'd expect.

65 percent of two-year-olds and 94 percent of four-year-olds lie at least once when given the opportunity.

And the children most likely to lie are not the morally compromised ones.

They are the cognitively advanced ones.

Lying requires inhibitory control, working memory, and flexible thinking - the building blocks of executive function. Psychology Today

At first, the lies are honestly terrible. Biscuit stolen. Crumbs still on face. Direct eye contact maintained throughout. "I didn't eat it." The sheer audacity is almost impressive.

But early lies are rarely manipulative in the adult sense. Young children lie to avoid trouble, test cause and effect, or simply wish something were true. They also genuinely struggle to separate fantasy from reality, which is why a four-year-old can insist with complete sincerity: "It wasn't me. It was the dinosaur." Part of them kind of believes it.

Why the Pointless Ones Though?!

This is what drives parents absolutely up the wall.

The toothbrush is bone dry. Still sitting exactly where you left it. …and your child is standing there with dragon breath powerful enough to melt steel. And yet: "Yes. I brushed them."

No, they did not push their brother.

No, they absolutely did not eat the chocolate, chocolate smeared across their face.

The lie is almost never about the teeth. Or the hands. Or the chocolate.

It is about:

avoiding your reaction
escaping another demand
protecting a tiny sense of autonomy in a life where almost every decision is made for them

Children learn quickly that truth can mean disappointment, frustration, or having to stop what they are doing right now. So their brain tries the shortcut. And our reactions are part of that equation.

The more explosive the parent gets, the more frightened the child gets, and the more likely they are to lie.

Research from McGill University found that punishment does not promote truth-telling. In fact, the threat of punishment can have the reverse effect, reducing the likelihood that children will tell the truth. GreatSchools McGill Reporter

The sterner you go, the more reasons you are giving them to lie next time.

So What Do We Actually Do?

Don't turn every lie into a courtroom.

The more emotionally charged the moment, the more defensive they become. Instead of "WHY ARE YOU LYING TO ME," try: "Hmm. I can see your hands are still dry. Let's go and wash them together."

Matter-of-fact. Calm. Boring, even. You have named what you see and moved on, without giving the lie a stage to perform on.

Stop setting them up.

This one is huge. If you already know they didn't wash their hands, don't ask "Did you wash your hands?"

That question creates a trap where the lie is the easiest exit.

Instead: "I see the tap is still dry - let's go and do it together."

Less interrogation. More guidance. You skip the power struggle entirely.

Praise honesty loudly when it happens.

This is the piece most parents miss. When your child admits to something difficult, acknowledge it specifically and warmly. "I really appreciate that you told me the truth about that, even though it was hard." Research shows that kids respond best to a strong moral appeal for honesty. Younger children are inclined to tell the truth to make an adult happy, while older children are inclined to do so because of their own internalised sense of right and wrong.

Build that. Name it. Celebrate it. Time

Tell them WHY honesty matters, not just that it does.

"When you tell me the truth, even when it's hard, I know I can trust what you say. And trust really matters to me."

That resonates more than "lying is wrong."

One is a rule. The other is a relationship.

Check your own behaviour, too.

This one stings a little. If you are sending your kids the message that truth is really important, but they see you telling occasional small fibs to get out of things (I still remember my dad mouthing to my mum, as she picked up the telephone "tell them I am not there"...), they will see lying as a strategy they can use. Adults lie more than we like to admit. To escape events we don't want to attend. To smooth social situations. And our children, who are watching us with considerably more attention than we realise, are taking careful, thorough, unflinching notes. Slate

To sum up

Your child lying to you about soap is a sign of a brain that is developing perspective, social intelligence, and the understanding that the world does not all live inside their own head.

Is it annoying? Beyond description.

Especially when you keep having the same conversation about soap & hands.

But the child who can look you in the eye and attempt to rewrite reality is, developmentally speaking, doing something right. Your job now is not to escalate until they confess. It is to build a home where the truth feels safer than the lie.

That is a longer game. But it is the one that actually works.

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Here's to raising smarter, more confident & resilient children - and more often than not, it starts with us.