One of the most unsettling moments for any parent is catching their child telling a lie. Whether it is denying they ate the last biscuit despite the crumbs on their face or insisting homework was never assigned, many parents immediately wonder if something has gone wrong. But child psychologists say that, in most cases, lying is not a sign that a child is becoming dishonest. Instead, it is often a normal part of growing up. In fact, research by developmental psychologists Victoria Talwar and Kang Lee has consistently found that lying emerges alongside important cognitive milestones. As children develop better memory, self-control and the ability to understand what other people know or believe, they also become capable of deception. Experts emphasise that while lying should be addressed, it should also be understood in the context of healthy brain development.
They are discovering that other people think differently
One of the biggest reasons children begin lying is because they develop what psychologists call “theory of mind”, the ability to recognise that other people have thoughts, beliefs and knowledge that may differ from their own. Once children understand that parents cannot automatically know everything they know, they realise they can change someone else’s perception of reality.
3 Jul 2026 | 12:38
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A landmark body of research by Talwar and Lee found that this cognitive leap usually appears between the ages of two and four, making simple lies increasingly common during the preschool years. Rather than signalling bad behaviour, it often reflects an important stage in social and intellectual development.
Fear of punishment often outweighs honesty
Sometimes, children lie for a much simpler reason: they want to avoid getting into trouble. If admitting the truth feels likely to lead to anger, punishment or disappointment, many children instinctively choose what they believe is the safer option.
Experimental studies involving school-age children have repeatedly shown that many children deny breaking rules even when they know adults may discover the truth later. Researchers suggest that these “self-protective lies” become more common when children expect harsh consequences rather than calm conversations about mistakes.
They want to protect someone’s feelings
Not every lie is selfish. As children grow older, they also begin telling what psychologists describe as “prosocial” or “white” lies. They may say they loved a birthday gift they did not actually enjoy or praise someone’s drawing to avoid hurting their feelings.Research on children’s white lies has found that these responses often reflect growing empathy and social awareness rather than manipulation. Learning when honesty should be balanced with kindness is part of developing emotional intelligence and understanding social relationships.
Children learn by watching adults
Experts often remind parents that children pay close attention to how adults communicate. If they regularly observe parents making excuses, exaggerating stories or telling harmless white lies, they quickly learn that honesty can sometimes be flexible.
A 2022 review examining children’s lying behaviour concluded that parents, siblings, teachers and the wider social environment all influence how children learn when telling the truth is expected and when deception appears acceptable. Children absorb these social rules long before adults realise they are watching.
Imagination and reality are still blending
Young children do not always lie intentionally. Sometimes they tell stories because imagination and reality overlap in their minds. A preschooler may genuinely insist that a toy disappeared because a dinosaur took it or describe an imaginary adventure as though it actually happened.Developmental experts note that younger children are still learning to separate fantasy from reality. As their cognitive abilities mature, they gradually become better at distinguishing imaginative storytelling from deliberate deception.
Lying can even signal stronger thinking skills
Perhaps the most surprising finding from developmental psychology is that children who successfully tell convincing lies often demonstrate stronger executive functioning skills. Constructing a believable lie requires memory, planning, self-control and the ability to keep track of another person’s perspective.Research has found that children with more advanced cognitive abilities are often better able to maintain consistency in their stories, although experts stress this is not an endorsement of lying. Instead, it highlights that deception depends on sophisticated mental processes developing with age.
How parents should respond
Experts recommend resisting the urge to label a child as “a liar”. Instead, they encourage parents to stay calm, understand why the child lied and create an environment where telling the truth feels emotionally safe. Overly harsh reactions may increase the likelihood of future dishonesty because children become more focused on avoiding punishment than being truthful.Research consistently suggests that children learn honesty best when adults model truthful behaviour, praise honesty even after mistakes and use lies as opportunities to teach trust rather than simply punish deception. Most children occasionally lie, but with patient guidance and open communication, honesty usually strengthens as they mature.