Behavior & Social

When Toddlers Start Lying: Is It Normal?

Medically reviewed by Dr. Emily Torres, PhD, CCC-SLP · Pediatric Speech-Language Pathologist

Content reviewed against published AAP, NIH, Zero to Three guidelines

Editorial policy

Last reviewed:

Behavioral development varies greatly from child to child. If you have noticed when toddlers start lying: is it normal, here is what you need to know.

The short answer

Lying actually requires sophisticated cognitive abilities including understanding that other people have different knowledge than you do (theory of mind), imagining an alternative reality, and controlling your expression. When your toddler first lies (typically around age 2-3), it is actually a cognitive milestone, not a moral failing. Most early lies are wish fulfillment ("I did not eat the cookie" while covered in crumbs) or fantasy, not calculated deception.

Key takeaways

  • Lying actually requires sophisticated cognitive abilities including understanding that other people have different knowledge than you do (theory of mind), imagining an alternative reality, and controlling your expression. When your toddler first lies (typically around age 2-3), it is actually a cognitive milestone, not a moral failing. Most early lies are wish fulfillment ("I did not eat the cookie" while covered in crumbs) or fantasy, not calculated deception.
  • Usually normal when: First lies appear around age 2-3 and are a cognitive milestone
  • Call your doctor if: Your child creates elaborate false accusations against others
  • Varies by age — see the age-by-age breakdown below

Parents everywhere have the same worry. You are doing the right thing by looking into it.

What Parents Should Know

According to AAP, NIH, Zero to Three guidelines, lying actually requires sophisticated cognitive abilities including understanding that other people have different knowledge than you do (theory of mind), imagining an alternative reality, and controlling your expression. When your toddler first lies (typically around age 2-3), it is actually a cognitive milestone, not a moral failing. Most early lies are wish fulfillment ("I did not eat the cookie" while covered in crumbs) or fantasy, not calculated deception. At 12-24 months, true lying does not exist at this age. What may seem like lying is actually limited understanding of questions, confusion between reality and imagination, or agreeing with whatever you say. Your toddler is not capable of deliberate deception yet. It is generally considered normal when first lies appear around age 2-3 and are a cognitive milestone. However, you should contact your pediatrician promptly if your child creates elaborate false accusations against others.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
First lies appear around age 2-3 and are a cognitive milestone
Your child creates elaborate false accusations against others
Lies are simple and obvious
Lying involves safety issues and your child cannot be relied upon for important information
Your child lies to avoid punishment or to wish something were true
Your child lies constantly about everything, including things with no consequence
Lying decreases with a supportive approach to honesty
Lying is elaborate and manipulative beyond what is expected for age

By Age

What to expect by age

12-24 months

True lying does not exist at this age. What may seem like lying is actually limited understanding of questions, confusion between reality and imagination, or agreeing with whatever you say. Your toddler is not capable of deliberate deception yet.

2-3 years

First lies emerge, usually simple denials ("I did not do it") or wish fulfillment ("I already brushed my teeth"). These lies are obvious and not sophisticated. Your child is testing out a new cognitive ability. Avoid trapping them with questions you already know the answer to. Instead of "Did you hit your sister?" try "I saw you hit your sister. Hitting hurts."

3-4 years

Lies become more elaborate. Your child may blame imaginary friends or siblings. This is still developmentally normal. Focus on making honesty easy: "If you tell me the truth, we can solve this together. I will not be angry." Praise honesty, even when it is about something they did wrong.

4-5 years

Children understand the concept of truth vs. lies and can be taught about honesty. They may still lie to avoid punishment. Create an environment where telling the truth is safe. "Thank you for telling me the truth. That was brave. Now let us figure this out together."

What to Tell Your Pediatrician

  • Describe when you first noticed when toddlers start lying: is it normal and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your child lies constantly about everything, including things with no consequence.
  • Mention if lying is elaborate and manipulative beyond what is expected for age.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • First lies appear around age 2-3 and are a cognitive milestone
  • Lies are simple and obvious
  • Your child lies to avoid punishment or to wish something were true
  • Lying decreases with a supportive approach to honesty
Mention at your next visit when...
  • Your child lies constantly about everything, including things with no consequence
  • Lying is elaborate and manipulative beyond what is expected for age
  • Your child seems unable to distinguish fantasy from reality by age 5
  • Lying is accompanied by other concerning behaviors like stealing or cruelty
Act now when...
  • Your child creates elaborate false accusations against others
  • Lying involves safety issues and your child cannot be relied upon for important information

What You Can Do at Home

  • Keep track of when you notice when toddlers start lying: is it normal — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that first lies appear around age 2-3 and are a cognitive milestone — this is generally within the range of normal.
  • At 12-24 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Respond consistently and calmly to your baby's behavior. Maintain predictable daily routines.
  • While monitoring at home, seek immediate care if your child creates elaborate false accusations against others.

When Do Toddlers Develop Empathy?

Empathy develops gradually through childhood and is not fully mature until adolescence. Toddlers show the earliest signs of empathy around 18-24 months when they may become upset seeing someone else cry or offer their own comfort object to a distressed person. True cognitive empathy - understanding how someone else feels and why - does not develop until around age 4-5. Your toddler is not lacking empathy; it simply has not developed yet.

Toddler Has an Imaginary Friend

Imaginary friends are a normal and healthy part of childhood development. Research shows that up to 65% of children have an imaginary friend at some point, most commonly between ages 2.5 and 7. Children with imaginary friends often have advanced language skills, greater creativity, better social understanding, and stronger emotional processing. An imaginary friend is a sign of a healthy imagination, not a problem.

Toddler Constantly Tests Boundaries and Limits

Testing limits is one of the most important jobs of a toddler. When your child looks at you and deliberately does the thing you said not to do, they are running an experiment: "Is this rule real? Is it the same every time? Does it apply with all adults?" Consistent, calm enforcement of boundaries actually makes children feel safer. They need to test the fence to know it is sturdy.

Building Emotional Intelligence in Toddlers

Emotional intelligence (EQ) - the ability to recognize, understand, and manage emotions in yourself and others - begins developing in early childhood. You build your toddler's EQ every time you name their feelings, validate their experience, help them understand others' emotions, and model healthy emotional expression yourself. This is one of the most important gifts you can give your child.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is when toddlers start lying: is it normal normal?
Lying actually requires sophisticated cognitive abilities including understanding that other people have different knowledge than you do (theory of mind), imagining an alternative reality, and controlling your expression. When your toddler first lies (typically around age 2-3), it is actually a cognitive milestone, not a moral failing. Most early lies are wish fulfillment ("I did not eat the cookie" while covered in crumbs) or fantasy, not calculated deception.
When should I call the doctor about when toddlers start lying: is it normal?
Your child creates elaborate false accusations against others Lying involves safety issues and your child cannot be relied upon for important information
When is when toddlers start lying: is it normal normal?
First lies appear around age 2-3 and are a cognitive milestone Lies are simple and obvious Your child lies to avoid punishment or to wish something were true
What causes when toddlers start lying: is it normal?
Lying actually requires sophisticated cognitive abilities including understanding that other people have different knowledge than you do (theory of mind), imagining an alternative reality, and controlling your expression. When your toddler first lies (typically around age 2-3), it is actually a cognitive milestone, not a moral failing. Most early lies are wish fulfillment ("I did not eat the cookie" while covered in crumbs) or fantasy, not calculated deception. Common explanations include: First lies appear around age 2-3 and are a cognitive milestone. Lies are simple and obvious.
What should I mention to my pediatrician about when toddlers start lying: is it normal?
You should mention when toddlers start lying: is it normal at your next visit if: Your child lies constantly about everything, including things with no consequence. Lying is elaborate and manipulative beyond what is expected for age. Your child seems unable to distinguish fantasy from reality by age 5.
Is when toddlers start lying: is it normal normal at 12-24 months?
True lying does not exist at this age. What may seem like lying is actually limited understanding of questions, confusion between reality and imagination, or agreeing with whatever you say. Your toddler is not capable of deliberate deception yet.
Is when toddlers start lying: is it normal normal at 2-3 years?
First lies emerge, usually simple denials ("I did not do it") or wish fulfillment ("I already brushed my teeth"). These lies are obvious and not sophisticated. Your child is testing out a new cognitive ability. Avoid trapping them with questions you already know the answer to. Instead of "Did you hit your sister?" try "I saw you hit your sister. Hitting hurts."
Should I go to the ER for when toddlers start lying: is it normal?
Seek emergency care if your child creates elaborate false accusations against others, or if lying involves safety issues and your child cannot be relied upon for important information. When in doubt, call your pediatrician's after-hours line for guidance.
Does when toddlers start lying: is it normal go away on its own?
In many cases, when toddlers start lying: is it normal resolves on its own, especially when first lies appear around age 2-3 and are a cognitive milestone. By 4-5 years, children understand the concept of truth vs. lies and can be taught about honesty. They may still lie to avoid punishment. Create an environment where telling the truth is safe. "Thank you for telling me the truth. That was brave. Now let us figure this out together."
AAPNIHZERO TO THREE

References

  1. [1]American Academy of Pediatrics. Lying and Children. HealthyChildren.org. AAP
  2. [2]Talwar V, Lee K. Social and cognitive correlates of children's lying behavior. Child Dev. 2008;79(4):866-881. NIH
  3. [3]Zero to Three. Honesty and Children. Zero to Three

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss When Toddlers Start Lying: Is It Normal?.

Things to mention

  • Describe when you first noticed when toddlers start lying: is it normal and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your child lies constantly about everything, including things with no consequence.
  • Mention if lying is elaborate and manipulative beyond what is expected for age.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • Your child lies constantly about everything, including things with no consequence
  • Lying is elaborate and manipulative beyond what is expected for age
  • Your child seems unable to distinguish fantasy from reality by age 5

Urgent signs to report immediately

  • Your child creates elaborate false accusations against others
  • Lying involves safety issues and your child cannot be relied upon for important information

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members

Related Resources

Baby Tracker

Bottom line

Most cases of when toddlers start lying: is it normal are normal. Talk to your pediatrician if your child creates elaborate false accusations against others.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

Share:FacebookX

Was this page helpful?

Related Behavior Concerns

When Do Toddlers Develop Empathy?

Empathy develops gradually through childhood and is not fully mature until adolescence. Toddlers show the earliest signs of empathy around 18-24 months when they may become upset seeing someone else cry or offer their own comfort object to a distressed person. True cognitive empathy - understanding how someone else feels and why - does not develop until around age 4-5. Your toddler is not lacking empathy; it simply has not developed yet.

Toddler Has an Imaginary Friend

Imaginary friends are a normal and healthy part of childhood development. Research shows that up to 65% of children have an imaginary friend at some point, most commonly between ages 2.5 and 7. Children with imaginary friends often have advanced language skills, greater creativity, better social understanding, and stronger emotional processing. An imaginary friend is a sign of a healthy imagination, not a problem.

Toddler Constantly Tests Boundaries and Limits

Testing limits is one of the most important jobs of a toddler. When your child looks at you and deliberately does the thing you said not to do, they are running an experiment: "Is this rule real? Is it the same every time? Does it apply with all adults?" Consistent, calm enforcement of boundaries actually makes children feel safer. They need to test the fence to know it is sturdy.

Building Emotional Intelligence in Toddlers

Emotional intelligence (EQ) - the ability to recognize, understand, and manage emotions in yourself and others - begins developing in early childhood. You build your toddler's EQ every time you name their feelings, validate their experience, help them understand others' emotions, and model healthy emotional expression yourself. This is one of the most important gifts you can give your child.

Bonding and Attachment Timeline for Adopted Babies

Bonding with an adopted baby is a real and achievable process, but it may follow a different timeline than biological bonding. Many adoptive parents feel a strong connection quickly, while for others it develops gradually over weeks or months. Consistent, responsive caregiving is the single most important factor in building secure attachment, regardless of how your family was formed.

Aggressive Play vs Normal Play

Rough-and-tumble play — wrestling, chasing, play-fighting, and superhero battles — is a normal and important part of child development, particularly for toddlers and preschoolers. It helps children develop physical coordination, social skills, self-regulation, and an understanding of boundaries. The key distinction between normal rough play and concerning aggression is whether both children are having fun, there is turn-taking in roles, and no one is intentionally trying to hurt the other.