7 Reasons Toddlers Have Tantrums

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It is 11:23 on a Tuesday morning and your two-year-old is on the kitchen floor. The immediate cause — as best as you can reconstruct it — is that you cut the toast into rectangles instead of triangles. Or gave the blue cup instead of the red one. Or said it was time to leave the park. Or turned off a television program that wasn’t over yet. Or, possibly, something you will never successfully identify.

The screaming has reached a volume that seems improbable for a person this small. The body has gone rigid, or boneless, or is making contact with the floor in ways that seem to require medical attention. The neighbors, if there are neighbors close enough, are almost certainly listening.

And somewhere in the middle of this, most parents have the same thought: Why is this happening? Not as a rhetorical question. As a genuine one. Because understanding what is actually producing the experience might change something about how it feels to be inside it, and possibly something about how often it occurs.

The research on toddler tantrums is more specific and more illuminating than most parents expect. Tantrums are brief episodes of extreme, unpleasant, and sometimes aggressive behaviors in response to frustration or anger — they occur once a day, on average, with a median duration of 3 minutes in 18- to 60-month-old children, with mood and behavior returning to normal between episodes. They are not a sign that something has gone wrong with your child or with your parenting. They are one of the most universal experiences in toddler development, across cultures, languages, and parenting philosophies.

But universal doesn’t mean mysterious. Here are the seven things most commonly driving them.

What the Research Tells Us About Tantrums First

Before the seven reasons, one finding that frames all of them.

The transition to toddlerhood from the first to the second year of life is a time of rapid change when increasing autonomy clashes with heightened environmental demands. During this transition period — when regulation shifts from more externally to internally mediated — there is an uptick in irritability as dysregulated outbursts, temper tantrums, and “fall-outs” become evident to parents, teachers, and pediatricians.

The phrase that matters most in that description is “regulation shifts from more externally to internally mediated.” The toddler is in the middle of the most demanding developmental transition in early childhood: the gradual transfer of emotional and behavioral regulation from the caregiver to the child. That transfer takes years. The tantrums are, in large part, the evidence that the transfer is underway — and not yet complete.

The 7 Reasons

Reason 1: Their Language Can’t Yet Carry the Feeling

This is the most empirically well-supported cause of toddler tantrums, and the one that most directly explains why tantrum frequency peaks at approximately age two — precisely when the gap between what a toddler wants to communicate and what their language system can actually express is at its widest.

It is a common clinical observation, stated on web pages for the American Academy of Pediatrics, Mayo Clinic, and others, that children with fewer words or lower expressive language ability have more temper tantrums. This is supported by the fact that temper tantrums peak around 2 years — an age when typically-developing toddlers are gaining greater independence, while also rapidly acquiring new words but only just beginning to combine them into utterances in order to communicate more complex thoughts and ideas. As language and other skills such as social-emotional functioning and self-regulation increase, children also show decreased frequency of temper tantrums.

The relationship is causal, not coincidental. A toddler who is experiencing frustration, disappointment, or want — states that are as neurologically real and as urgent as anything an adult experiences — has a communication system that is simply not yet equipped to carry those states in words. The feeling is big. The vocabulary for it is small or absent. The tantrum is what happens when the communication gap is too wide to cross any other way.

The Northwestern University community sample study (Manning, Roberts, Estabrook, Wakschlag and colleagues — PMC, 2021) confirmed the association directly: toddlers with expressive language delays showed nearly double the rate of dysregulated tantrums compared with age-matched peers with typical language development. The mechanism is the communicative gap itself — when the available language can’t carry the feeling, the feeling finds its own way out.

What this means for parents:

Building vocabulary actively — naming feelings as they arise, narrating emotional experience, reading books that describe inner states — is not just early language development. It is, in a direct neurological sense, tantrum prevention. The child who has the word “frustrated” available has an alternative to the floor.

Reason 2: Their Brain Is Still Being Built

The tantrum is not just a communication problem. It is a neurodevelopmental one. The region of the brain most responsible for the capacities that tantrums require — impulse control, emotional regulation, the ability to tolerate frustration, the capacity to hear “no” and not act on the first reactive impulse — is the prefrontal cortex, and it is the last region of the brain to fully mature. Its development is not complete until the mid-twenties.

In the toddler years, the prefrontal cortex is in very early development. The limbic system — the brain’s emotional and threat-detection center — is well-established and running at full volume. What this means, in practical terms, is that the toddler brain is heavily limbic and lightly prefrontal: it feels intensely and regulates poorly, not because of a failure of character or a failure of parenting, but because the neural architecture that produces the regulation simply isn’t there yet.

During the toddler transition period, regulation shifts from more externally to internally mediated. The toddler who was emotionally regulated by a caregiver’s presence and responsiveness is now beginning the long process of developing internal regulation — of building, through thousands of experiences of co-regulation with an attuned adult, the internal scaffolding that will eventually allow them to manage big feelings independently. That process takes years. In the meantime, the emotion arrives at full intensity and the brain that’s supposed to manage it is still largely under construction.

The impulse control development PMC study tracking 710 children from grades 1 through 5 found that striking developmental advancements in inhibitory control first occurred at ages 6–7.5 — well after toddlerhood. The toddler whose tantrum looks like a failure of self-control is a child whose brain has not yet built the infrastructure self-control requires.

What this means for parents:

The tantrum is not evidence of a child who won’t regulate. It is evidence of a child whose regulatory systems are developing — exactly as they should, on exactly the timeline that neuroscience would predict. Your presence and calm are not passive witnesses to the tantrum. They are the co-regulatory scaffold on which the child’s own eventual self-regulation is being built.

Reason 3: They Want Independence Their Body Can’t Yet Deliver

This is the quintessential toddler paradox — and the one at the heart of so many tantrum triggers that seem, from the outside, disproportionate or incomprehensible. The toddler desperately wants to do the thing themselves. They are, developmentally, in the period of emerging autonomy — the period in which the drive toward independence is among the most powerful forces in their psychological life. And simultaneously, they cannot reliably do the thing themselves. The zipper is too complicated. The shoe won’t go on. The tower won’t stay up. The juice goes everywhere. The gap between the desire and the capability is the gap in which many tantrums live.

The transition to toddlerhood is a time of rapid change when increasing autonomy clashes with heightened environmental demands. The autonomy drive is not a behavioral quirk. It is a biological imperative — the developmental motor that pushes the child toward independence and competence. Self-Determination Theory identifies the need for autonomy as universal and innate: its satisfaction produces well-being; its frustration produces exactly the distress the tantrum expresses.

The frustration compounds when the parent, watching the increasingly unsuccessful attempt to do the thing independently, steps in to help. The toddler who was already dysregulated by the gap between wanting and being able is now also dysregulated by having the autonomy attempt interrupted. Both the failure to do it alone and the adult doing it for them can be tantrum triggers — because both experiences deliver the same message to the autonomy drive: you can’t.

What this means for parents:

Where possible, allow the attempt to run its course, even when it’s clearly heading toward failure. “Do you want to try, or do you want my help?” gives the child agency over whether assistance arrives. When the failure happens anyway and the tantrum begins, naming what happened — “you really wanted to do that yourself and it’s so frustrating when it’s hard” — is the vocabulary the child doesn’t yet have for what they’re experiencing.

Reason 4: They’re Overwhelmed by Feelings They Have No Tools for Yet

The toddler who has a tantrum over the broken cracker is not actually having a tantrum about the cracker. They are having a tantrum because the feeling of disappointed expectation that arrived when the cracker broke is, right now, bigger than the regulatory system they have available to manage it. The cracker was the trigger. The capacity for regulation is what determines whether that trigger produces a manageable disappointment or a full physiological storm.

That capacity is genuinely limited in toddlerhood — not as a character flaw but as a neurological fact. The emotion regulation development research by De Raeymaecker and Dhar (PMC, 2022 — systematic review of parenting factors in emotion regulation in middle childhood) confirms the developmental trajectory: emotion regulation capacity is one of the most gradually developing skills in childhood, and in toddlerhood its foundations are still being laid. The toddler who cannot manage the disappointed feeling about the cracker is not overreacting. They are at their actual regulatory limit.

The Potegal and Davidson analysis of tantrum behaviors in 335 children ages 18 to 60 months found that tantrums have two major emotional components — anger and distress — that are physiologically distinct and often sequence in a specific pattern: anger peaking early, followed by distress and comfort-seeking as the anger subsides. That sequence is not random. It reflects the actual neurological arc of the dysregulated toddler: the activation peaks, the prefrontal system begins to find its footing, and the need for comfort emerges as the storm starts to pass. The comfort-seeking at the end of a tantrum is not manipulation. It is the nervous system doing exactly what it should: looking for the co-regulatory presence that will help it complete the return to baseline.

What this means for parents:

The tantrum over the cracker was never about the cracker. It was about the feeling, and the child’s current inability to manage that feeling with smaller responses. As the vocabulary for feelings grows, as co-regulation with a calm adult happens repeatedly over hundreds of such moments, the regulatory capacity grows with it. The tantrum frequency doesn’t decrease because the child decides to try harder. It decreases because the system that manages feelings has been built.

Reason 5: They’re Tired, Hungry, or Sensory-Overloaded

This one is the most physiologically direct of the seven reasons and the most immediately actionable. A toddler who is operating under conditions of fatigue, hunger, or sensory overload has a prefrontal cortex that is even less available than usual — which is already not very available — and a limbic system that is correspondingly more reactive. The situation that would produce a manageable moment of frustration in a rested, fed, physiologically regulated toddler produces a full tantrum in the same toddler two hours past naptime or an hour before lunch.

Tantrums most commonly occur between the ages of 2 and 3, but may occur as young as 12 months. The physiological triggers — fatigue, hunger, and sensory overload — are among the most consistent predictors of when within that developmental window a tantrum will actually occur. Not all toddlers tantrum with equal frequency at all times of day and in all environments. The tantrum that reliably happens at 5pm is a different phenomenon from a baseline regulatory deficit. It is a regulatory deficit that is situationally exacerbated by the end-of-day depletion of a three-year-old who has been regulating for eight hours.

The sensory dimension is equally important. Young children’s nervous systems are calibrated to process sensory input from a world they are still learning to navigate — and that calibration varies significantly by temperament. Some toddlers can manage a grocery store on a busy Saturday afternoon. Others cannot — and the tantrum that occurs in that environment is not behavioral failure. It is sensory overload finding the only exit available.

What this means for parents:

The HALT framework — Hungry, Angry (activated), Lonely, Tired — is useful precisely because it redirects the parental question from “what is wrong with this child” to “what does this child’s nervous system need right now.” A snack before the outing, a nap before the party, a quieter environment when the cumulative stimulation is high — these are not concessions to tantrum behavior. They are the environmental management of a developing nervous system whose resources are finite.

Reason 6: Something Changed Without Warning

Toddlers are routine-dependent creatures. The predictability of their environment is not a preference — it is a regulatory support. The young nervous system that doesn’t yet have robust internal regulatory capacity leans heavily on the external regulatory support of a predictable world: this is what comes next, this is what this place is, this is how this works. When the expected sequence changes — when the routine is disrupted, when the transition arrives without warning, when the expected thing is not available, when the environment is unfamiliar — the regulatory support that predictability provided is suddenly absent, and the deficit that results often shows up as a tantrum.

Temper tantrums are common in children between the ages of 18 months and 4 years, with behaviors ranging from commonplace crying to less-frequent, attention-getting events such as breath-holding and head-banging. A significant proportion of these events are transition-triggered — the behavioral expression of a nervous system that was counting on the familiar and encountered the unexpected instead.

The routines and child development systematic review (Selman and Dilworth-Bart, 2024) found that family routines are directly associated with improved behavioral regulation in children — including toddlers. The regularity of routine provides the anticipatory framework the toddler’s nervous system uses to prepare for what’s coming. When the framework is disrupted, the preparation wasn’t made, and the transition meets an unprepared nervous system.

What this means for parents:

Transition warnings — “in five minutes we’re leaving,” “in five minutes the TV goes off” — are neurological preparation, not negotiation. They give the toddler’s nervous system a window to begin disengaging from the current state before the transition is demanded. Two warnings — five minutes, then one minute — is usually sufficient to dramatically reduce the transition-triggered tantrum. The child who has been warned is behaviorally in a different place than the child who has been told to stop immediately. That different place is, consistently, more manageable.

Reason 7: It Has Worked Before

This final reason is the one that is most actionable for parents, and the one that requires the most honest reflection. A significant proportion of toddler tantrums are maintained — not started, but maintained and repeated — by something that happened in response to a previous tantrum. The treat that was given when the grocery store tantrum became too much. The screen that was offered to end the meltdown. The demand that was softened or abandoned when the crying reached a certain volume. Each of these responses, individually, is understandable. Accumulated across dozens of tantrum episodes, they teach the child’s behavioral system something specific: that this level of escalation produces a different outcome than the level before it.

This is not strategic behavior in toddlers. It is operant conditioning — the same learning mechanism by which all behavior is shaped. Behavior that produces desired outcomes is repeated. A tantrum that reliably produces the treat, the screen, or the retracted demand is a tantrum whose frequency the environment has increased, regardless of any parent’s intention.

The van den Akker and colleagues Erasmus University Rotterdam study (PMC, 2022 — N=861 toddlers ages 10 months to 5 years) found three longitudinal behavioral profiles of toddler tantrum development — including one profile in which tantrum severity increased over time rather than following the expected developmental trajectory of decrease. The trajectories were not fixed at birth. They were shaped by the interactional environment — including the responses to tantrums that either reinforced or didn’t reinforce the behavior.

Giving in to demands may reinforce undesired behaviors. This is the clinical summary of sixty years of behavioral research, condensed to one sentence. The tantrum that is responded to with consistent, warm, non-capitulating presence teaches a different lesson than the tantrum that eventually produces the thing it was asking for.

What this means for parents:

When the tantrum is related to a denied request, the warmth of the response matters enormously — but the firmness of the limit matters equally. The parent who can hold the limit warmly, with empathy for the child’s distress and without giving in to the demand, is doing the most important behavioral teaching available: that the escalation doesn’t change the outcome, and that the outcome is navigable. That lesson, absorbed across many consistent tantrum experiences, produces a toddler whose tantrum frequency decreases — not because anything has been punished, but because the behavioral system has updated its model of what tantrums produce.

The Bigger Picture

Each of these seven reasons points to the same underlying reality: the toddler tantrum is almost never a behavioral failure. It is the expression of a developing system — neurological, linguistic, regulatory, emotional — that is not yet equipped to handle the full complexity of being a person in a world that doesn’t always cooperate.

Temper tantrums are generally believed to be a normal phenomenon that naturally fades as children grow. And the research confirms exactly this: as language expands, as the prefrontal cortex matures, as emotional vocabulary grows, as self-regulation develops through thousands of co-regulatory interactions with attuned adults — the frequency and intensity of tantrums decrease. Not because children are corrected out of them. Because the systems that were producing them have been built.

The parent who understands this is the parent who can be present in the middle of a tantrum without taking it personally, without escalating it, and without having to know immediately what to do. Sometimes the most useful thing is to understand what’s happening well enough to stay steady inside it. That steadiness — offered consistently, across hundreds of tantrum moments — is doing more developmental work than it looks like.

When to Pay Closer Attention

Most toddler tantrums are typical and developmental. When tantrums are very frequent (multiple times per day most days), very long in duration (regularly exceeding 15–25 minutes), involve self-injury, occur in a child who seems consistently distressed between episodes, or show no signs of decreasing past age four — a conversation with a pediatrician or developmental specialist is appropriate. These patterns may indicate a language delay, a sensory processing difference, a developmental condition, or another issue that responds well to early assessment and support. The vast majority of toddler tantrums don’t require clinical attention. The subset that does is identifiable — and early identification matters.

Which of these seven is most recognizable in your toddler’s tantrum pattern? And which has changed how you think about what’s happening when the screaming starts? Share in the comments — the specific details of what works for a real family are always the most useful thing another parent can read.

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