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Ask Dr. Ana: How Can I Manage My Toddler’s Aggressive Behavior?

Dealing with a 3-year-old's tantrums and aggression can be challenging, but understanding the root causes and responding with consistency can make a significant difference. Here’s Dr. Ana’s advice for a parent whose preschooler is suddenly out of control.

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Updated: December 4, 2025
Kids fighting
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Updated: December 4, 2025

A parent asks for help with their 3.5-year-old son who has recently started fighting with his older brother and having public meltdowns, and Dr. Ana provides strategies to manage this difficult phase.

My 3-Year-Old Is Out of Control. What Can I Do?

Question: “My preschooler is out of control. He is 3.5 years old and won't stop fighting with his older brother (5 years old), including punching, hitting, and kicking without provocation that I can see. It's also started to become public meltdowns where he'll lose his mind over nothing and I have to peel him off of the pavement and dodge his little fists as he screams so hard he stops breathing right. He's always been so sweet, but not anymore. What on earth can I do? The doc says there's nothing actually physically wrong and now my other kids and pets are starting to give him a wide berth. I just feel like I'm failing.”

Dr. Ana’s Expert Answer

I would like to start thinking about you first: You are not failing. When our child shows difficult behaviours, it is easy to think that we are failing as parents but that is not it. You are doing the best you can with the tools you have. Try to let go of your guilt. As parents we all go through challenging periods.

Now let’s think about your child:

Investigate the Cause of the Behavior

  • You mention he is displaying this challenging behaviour at home. What about nursery or preschool? Is he displaying similar behaviour? Talk to his teacher to find out if you have not done so.
  • Has something happened in his life? Have you gone through a divorce, have you moved homes, or had a new baby?
  • If your child is behaving this way at home and at nursery, it could suggest that he is having trouble regulating his emotions. This is something very common for children his age.

How to Respond to Aggression and Tantrums

  • Whenever he hits his older brother gently tell him: “No, you cannot hit/scream/bite”. Tell him every time he behaves that way.
  • Whenever he throws a tantrum wait for it to pass. Do not give in to whatever it is he wants because if you reinforce his behaviour, he will do it again. I know it can be incredibly difficult to watch your child scream and kick but it is the best thing to do. Stay close, make sure he is safe, and wait it out. It is useless trying to reason with him once the tantrum has started because he cannot reason.
  • Keep these strategies and be consistent. Consistency is key.

Encourage Positive Behaviors

  • It is likely that as your toddler gets better at speaking, he will no longer have the need to behave aggressively. Sometimes, toddlers behave aggressively because they get frustrated when they cannot convey their feelings and thoughts to us.
  • Praise him. Children like to please their parents, so whenever he does something good, praise him and smile at him: “Look how well you have shared with your brother”; “You have helped me so much today”.

The Importance of Routine and Boundaries

  • Establish a consistent routine so your child knows when it is time to go to bed, have a bath, eat, and play. Children need clear boundaries and routines because it brings them security and stability.
  • Finally, always remember your child is not bad or aggressive. It is only that sometimes he behaves aggressively.

I hope these strategies work. Do get in touch with me if you want to discuss it further.

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I wish you all the very best. 

Ana

Dr Ana Aznar

Why Is My 3-Year-Old Suddenly So Aggressive?

Sudden aggression in a 3-year-old can often be linked to difficulty regulating big emotions, which is common for this age. It can also stem from major life changes like a new sibling or moving homes. Sometimes, aggression arises from frustration when toddlers can't express their feelings verbally. Check with their preschool to see if the behavior is happening there as well.

How Do You Handle an Out-of-Control 3-Year-Old?

When your 3-year-old is having a tantrum, stay calm and ensure they are safe. It's best to wait for the tantrum to pass without giving in to their demands, as this can reinforce the behavior. For aggression like hitting, firmly and gently say, "No, you cannot hit." Consistency is crucial for these strategies to be effective over time.

How Do You Discipline a 3-Year-Old Who Doesn't Listen?

Discipline for a 3-year-old should focus on clear boundaries and consistency. Establish a predictable daily routine for meals, naps, and playtime to create a sense of security. Use positive reinforcement by praising good behavior, like sharing or helping. Remember to distinguish the behavior from the child—they aren't "bad," they are just exhibiting challenging behaviors that need gentle correction.

For more information, check out these popular topics:

Do you have any parenting questions for our parenting coach and expert, Dr. Ana Aznar? Ask for free today!


Dr. Ana Aznar

About Ana

Dr. Ana Aznar is the founder of REC Parenting. She is a psychologist with a passion to support… Read more

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