How long does the "terrible twos" phase last? An honest timeline

There are questions parents Google at half past midnight, and this is one of them: How much longer will this last? The realistic answer is less comforting than what you’ll find in many guidebooks. But it’s more helpful.

Here’s how it unfolds, year by year, and the factors that really influence how long it lasts.

In short

The “terrible twos” usually begin between 18 months and 2 years of age, peak between 2 and 4, and gradually subside by the child’s fifth or sixth birthday. There’s no set end date. The tantrums become less frequent over the course of months and gradually lose their intensity.

The Course, Year by Year

Every child develops at their own pace. Nevertheless, a typical pattern can be described to give you a rough guide.

• Around 18 months: first signs. The child protests noticeably when things don’t go their way.
• At age 2: the classic phase begins. Frequent, physical tantrums; the “big no.”
• At age 3: often the peak. The child now has a larger vocabulary and more stamina; tantrums turn into full-blown power struggles.
• At age 4: a gradual decline. The outbursts become less frequent but more verbose.
• Ages 5 to 6: The tail end. Occasional intense moments when the child is tired or during times of change, interspersed with long periods of calm.

Why this phase doesn’t end in a single day

The defiant phase doesn’t stop like a fever that you measure and declare over. It fades away gradually. First, the frequency changes: daily outbursts become weekly ones, and later only occasional ones. Only then do the individual outbursts become shorter. And at some point, even in the midst of a brewing storm, you’ll still be able to reach your child and change their mind.

Many parents only realize the end has come in hindsight. At some point, you notice that the last real tantrum was weeks ago. That’s what saying goodbye to this phase looks like—unspectacular and without fanfare.

What Really Influences the Duration

Three factors make the difference, and only one of them is within your control. The first is temperament: emotionally intense, strong-willed children go through this phase more intensely and often for longer. This is simply part of your child’s nature; your parenting has nothing to do with it.

The second is life circumstances, such as a change in daycare, the arrival of a sibling, a move, or a separation. Any major change can cause a phase that was already winding down to flare up again. Your child is reacting to stress this way, just as adults also become more sensitive when under pressure. This isn’t a step backward.

The third factor is the adults’ reaction. This isn’t meant to imply blame, but simply reinforcement: Anyone who makes a big deal out of every tantrum or changes the rules depending on how they’re feeling that day unintentionally prolongs the phase. Long discussions have the same effect. Calm, predictable reactions won’t drastically shorten the phase, but they do prevent it from becoming entrenched.

Comparisons with Other Children

“The neighbor’s daughter never had a tantrum,” says the neighbor. Maybe that’s even true. Still, it says nothing about your child. The range of normal development here is vast: There are children who are done with protesting by three months, and children who practice for four years. Both can be perfectly healthy.

If you’re worried about whether your child is still within the normal range, focus on the trend rather than on comparisons: Is it gradually getting easier when viewed over the course of months? Then you’re on the right track, no matter what the neighbor says. If things are getting harder, read the article “The ‘Terrible Twos’ or More” and discuss your observations with your pediatrician’s office.

Frequently Asked Questions

When does the “terrible twos” phase begin?

The first signs often appear around 18 months; the actual phase usually begins around the second birthday. An earlier or later start is no cause for concern.

How long does the “terrible twos” phase usually last?

For most children, it subsides between their fourth and sixth birthdays. The end comes gradually: the tantrums first become less frequent, then shorter, and eventually you’ll be able to reach your child again even in the midst of a tantrum.

Can the “terrible twos” skip your child entirely?

Some children only experience a mild version—this is a matter of disposition. A sense of self-will develops regardless. If there’s no protest at all and your child seems unusually well-adjusted and quiet overall, you should bring this up with your pediatrician.

My child is 5 and the tantrums are getting worse. Is this still normal?

An increase in tantrums after their fourth birthday is a reason to take a closer look, especially if daycare or school reports similar behavior. The first step is a conversation with your pediatrician—there’s no need to panic.

What helps now

The defiant phase lasts longer than most guidebooks promise—and shorter than it feels on bad days. It ends as your child matures. No parenting trick can speed this up—you can only support your child through it. So prepare yourself for a long-distance race rather than a sprint. And take good care of yourself along the way, because you’re running alongside them.

Read more and learn more

• Autonomy Phase: An Overview: What Actually Develops Throughout This Phase.
• The “terrible twos” at age 2: The beginning, the big “no.”
• The defiant phase—or something more?: For anyone whose gut feeling won’t let them rest easy.
• Free e-book for exhausted parents: Support for the long haul.