Most babies start having tantrums around 12 months old, though the behavior becomes far more common between 18 and 24 months. By that age range, roughly 87% of toddlers are having tantrums. The behavior peaks between 30 and 36 months, when 91% of children tantrum, then drops noticeably after age 3. By 42 to 48 months, about 59% of children still have them.
Why Tantrums Start When They Do
The timing isn’t random. Around a child’s first birthday, several developmental changes collide in a way that makes tantrums almost inevitable.
First, toddlers develop a new sense of self-awareness. They begin to understand that they are separate people with their own desires, and that other people have different thoughts and feelings. This is a major cognitive leap, but it comes with a frustrating side effect: they now have strong opinions about what they want, and almost no ability to wait for it or stop themselves from acting on those desires.
Second, there’s a significant gap between what toddlers understand and what they can say. A 14-month-old may fully grasp that you’re putting away the crackers, but lack the words to negotiate for one more. Children with poorer expressive language skills are especially prone to tantrums, likely because they resort to emotional outbursts as a form of communication when words fail them. Research from Northwestern University found that children who have delayed expressive language but normal comprehension show more behavioral difficulties, supporting the idea that the frustration of not being able to say what you mean is a direct driver.
Third, the brain itself isn’t ready for emotional control. The part of the brain responsible for planning, impulse control, and regulating emotions (the prefrontal cortex) is one of the slowest regions to mature. Meanwhile, the brain’s emotional alarm system (the amygdala) is already active and responsive. A toddler essentially has a fully operational accelerator and barely functional brakes. This mismatch is biological and completely normal.
What a Typical Tantrum Looks Like
Parents sometimes worry their child’s tantrums are unusually frequent or long, so it helps to know what’s average. A longitudinal study published in the Journal of Developmental and Behavioral Pediatrics found that for one- and two-year-olds, the most common tantrum frequency was once or twice per month. About 10% to 12% of children in that age group had daily tantrums, which is less common but still within the normal range.
Most tantrums in one- to three-year-olds last between one and five minutes. About 37% of two-year-olds had tantrums lasting six to ten minutes, and roughly 10% had episodes stretching to 30 minutes. According to Johns Hopkins Medicine, most tantrums resolve within 15 minutes, with the child recovering and moving on with their day.
Common Triggers in Early Toddlerhood
Tantrums rarely come out of nowhere, even when they seem to. The most reliable triggers are physical states: hunger, tiredness, and overstimulation. A toddler who skipped a nap or is 20 minutes past snack time has a dramatically lower threshold for frustration. You’ll often notice tantrums cluster around transitions (leaving the park, getting into the car seat) and situations where the child’s desire for independence clashes with reality, like wanting to put on shoes alone but lacking the motor skills to do it.
For the youngest tantrum-throwers, around 12 to 18 months, the triggers tend to be simpler: a toy taken away, being picked up when they want to explore, or not understanding why they can’t have something they see. As children approach two and three, tantrums become more complex. They may involve social situations, like not wanting to share, or abstract frustrations, like not being able to make something work the way they imagined.
When Tantrums Signal Something More
The vast majority of tantrums are a normal, healthy part of development. But certain patterns can indicate something beyond typical behavior. Johns Hopkins Medicine identifies several red flags worth paying attention to:
- Aggression: If tantrums regularly involve the child injuring themselves, hurting others, or destroying property, that goes beyond typical behavior.
- Duration and frequency: Tantrums that last significantly longer than 15 minutes, happen multiple times per day, or continue regularly past age 5 may warrant professional evaluation.
- Physical symptoms: Breath-holding spells, headaches, stomachaches, or signs of anxiety alongside frequent tantrums suggest the child may need additional support.
How to Respond During a Tantrum
Because tantrums stem from a brain that genuinely cannot regulate big emotions yet, the most effective response is staying calm yourself. Your toddler’s prefrontal cortex isn’t developed enough to process reasoning or negotiation mid-meltdown, so long explanations during a tantrum won’t land. Staying physically close and emotionally neutral gives your child a sense of safety without reinforcing the behavior with extra attention or giving in to the demand that triggered it.
Before the tantrum peaks, you can sometimes redirect attention to something else. This works better with younger toddlers (12 to 18 months) whose emotional episodes are shorter and more easily interrupted. For older toddlers in the two-to-three range, once a tantrum is fully underway, the most practical approach is to wait it out in a safe space. Acknowledge their emotion briefly (“You’re really upset”) and then let the wave pass. Trying to reason, punish, or lecture during the tantrum itself tends to escalate rather than resolve it.
The period right after a tantrum matters too. Once your child calms down, that’s when their brain is receptive again. A brief, simple conversation about what happened (“You wanted the cup and got frustrated”) helps build the emotional vocabulary they’ll eventually use instead of screaming. This is a long game. The language and self-regulation skills that replace tantrums develop gradually over the preschool years, which is exactly why tantrums decline naturally by age four in most children.