It is half past seven in the morning and you need to leave the house in ten minutes. Zosia is two years and three months old and has just discovered that she can fasten the Velcro strap on her shoe by herself. Her mum, glancing at the clock, bends down and fastens it for her. Zosia throws herself on the floor, screams, kicks her legs and pulls both shoes off. Her mum, who only yesterday heard “mummy, love you”, looks at the clock and thinks: already? Is this the famous terrible twos?
Most likely it is, and most likely nothing is wrong. What Polish parents call bunt dwulatka — literally “the two-year-old’s rebellion” — and English speakers call the terrible twos is one of the best-described stages of early development. This article explains where it comes from, what it looks like, what paediatricians and early-childhood specialists say helps, what is better avoided, and how to tell when it is worth talking to a doctor.
What are the terrible twos?
The terrible twos is an everyday name for the period, roughly between eighteen months and three years, when a young child starts to insist firmly on independence: saying “no!”, resisting requests and having tantrums. The US Centers for Disease Control and Prevention (CDC) describes the terrible twos as the stage when toddlers begin to assert their independence.
It is not a diagnosis or a disorder, just an ordinary part of development. The American Academy of Pediatrics (AAP) writes in its guidance for parents that tantrums are a normal part of development and most often occur between the ages of one and three. The UK’s National Health Service (NHS) says that tantrums usually start at around 18 months and are very common in toddlers.
The word “rebellion” in the Polish name can be misleading, because it suggests the child is fighting the parent. In reality a two-year-old is mostly fighting their own limits: they want more than they can manage, and they feel more than they can express.
Why do the terrible twos happen?
The terrible twos come from three things happening at the same time: a growing drive for independence, language that has not yet caught up with thoughts and feelings, and impulse control that is still immature. Each of them on its own is an ordinary stage of development; together they produce the mix parents know as the terrible twos.
Independence. In its tips for parents of children aged 1–2, the CDC notes that toddlers in this period become more independent, more aware of themselves as separate people, and may be defiant. The AAP adds that a two-year-old spends most of their time testing limits — their own, the parent’s and their environment’s. When they overstep a limit and are pulled back, they often react with anger, a tantrum or sullen sulking.
Language. The NHS explains that toddlers often have tantrums because they want to express themselves but find it hard, and the frustration comes out as a tantrum. Zero to Three, a US organisation focused on children up to the age of three, says something similar: children are still learning to put their thoughts and feelings into words. According to the CDC, a two-year-old usually already puts at least two words together, such as “more milk”. That is a lot, but still not enough to say: “I wanted to fasten my shoe myself because I’ve just learnt how.” How language develops at this age is covered in our article on when children start talking.
Impulse control. Zero to Three stresses that a young child’s brain cannot yet stop itself from acting on impulse. A two-year-old can repeat the rule “we don’t hit”, but until about three and a half to four they usually do not have enough control to follow it consistently. The AAP describes the same thing from the other side: a two-year-old has limited control over emotional impulses, so anger can erupt suddenly as crying, screaming or hitting.
On top of that come ordinary physical causes. The NHS and MedlinePlus, the medical information service of the US National Library of Medicine, mention tiredness and hunger; MedlinePlus adds illness. Zosia from the opening of this article was also being hurried in the morning — a situation in which all these factors come together at once.
Terrible twos signs every parent recognises
The signs of the terrible twos are mainly frequent “no!”s, tantrums with crying, screaming and throwing themselves on the floor, sudden mood swings and attempts to do everything on their own. Some children also hit, bite or kick. The intensity varies a great deal — from the occasional outburst to several difficult moments a day.
The most common behaviours described by the sources are:
- “No!” to almost every suggestion — even to things the child enjoys. The CDC notes that a child of this age may be defiant as they discover their own separateness.
- Tantrums — crying, screaming, throwing themselves on the floor, kicking. MedlinePlus says that between 12 months and 3 years they can happen at least once a day.
- Sudden mood swings — the AAP writes that a two-year-old can switch in an instant from cheerful to sullen and weepy, often for no obvious reason, and that this is simply part of growing up.
- “Me do it!” — the urge to dress, eat or press the lift button on their own.
- Hitting, biting, kicking — the NHS stresses that these are common in young children and do not mean the child will grow up to be aggressive.
- Difficult separations — the AAP describes how a two-year-old may protest at being separated from a parent with anger, crying, clinging or by going quiet.
Many parents notice that their child is “better behaved” with a grandparent or a babysitter. The AAP explains that this is normal: a two-year-old does not trust other people enough to test limits with them, while with their parents they take bigger risks because they know they will be caught. Outbursts with mum or dad are, in a sense, a sign of trust.
Temperament matters. The AAP points out that some children have many tantrums and others few, and that more tantrums do not mean a parent is giving the child too little attention.
What the sources say about tantrums in two-year-olds
Medical and developmental sources differ in the details but agree on the direction: tantrums start in the second year of life, peak in two-year-olds and fade as the child talks better and gains control over impulses.
| Source | When they start | When they fade | What it emphasises |
|---|---|---|---|
| NHS (UK) | usually around 18 months | as speech develops; far less common by age 4 | frustration of a child who cannot express themselves |
| AAP (USA) | most often between ages 1 and 3 | usually after age 3, but they don’t disappear entirely | a normal part of development, temperament |
| MedlinePlus (USA) | between 12 months and age 3 | less often at ages 3–5, rare after 5 | wanting independence, lacking words; tiredness, hunger, illness |
| Zero to Three (USA) | rapid change between ages 1 and 3 | impulse control matures around 3½–4 | language and immature self-control |
| CDC (USA) | second year: more independence, possible defiance | — | the “terrible twos” is the stage of asserting independence |
The table makes one important point: there is no single date on which the terrible twos start and end. One child starts before their second birthday, another just before their third.
How to cope with the terrible twos day to day
The terrible twos are easiest to handle before an outburst rather than during one. The sources agree on several ways to reduce the number and intensity of tantrums: a steady daily rhythm, small choices, warning about transitions, picking your battles, and plenty of attention when the child is behaving well.
- A steady daily rhythm. The AAP writes that consistent daily routines, over time, reduce how often and how intensely tantrums happen. MedlinePlus recommends regular meal and sleep times and quiet time to rest, even once the child has stopped napping.
- Watch for patterns. If tantrums happen when the child is hungry, the AAP suggests taking a healthy snack on outings; if they happen when the child is tired, protect naps and bedtime.
- Small choices instead of yes-or-no questions. The AAP and Zero to Three suggest offering a choice between a few options: “the blue cup or the red one?”. Both organisations and MedlinePlus warn against asking about something where there is no real choice — “shall we have a bath?” invites the answer “no”.
- Give warning before play ends. Zero to Three advises giving advance notice that an activity is about to end, while noting that it will not always work.
- Pick your battles. Both the AAP and Zero to Three recommend deciding which limits really matter and where you can be flexible. MedlinePlus advises not arguing over minor things and focusing on safety.
- Invite rather than order. MedlinePlus encourages an upbeat, inviting tone instead of commands.
- Catch your child being good. The AAP encourages generous, specific praise for good behaviour, and the CDC suggests praising more often than punishing.
- Let them do it themselves. The CDC advises letting a child aged 1–2 dress and feed themselves, because it builds independence. If you know your two-year-old wants to fasten their own shoes, plan an extra five minutes in the morning.
Many of these points also come up in our article on what a 2-year-old should be able to do — development at this age and a predictable daily rhythm go hand in hand.
What should you do when a tantrum starts?
When a tantrum has already started, the most important thing is for the adult to stay calm, keep the child safe and wait out the storm without giving in. Zero to Three calls this co-regulation: your calm helps the child settle, while your agitation adds to emotions they are already unable to handle.
Specific steps from the sources:
- Stay calm and stay close. The NHS says that shouting or losing your temper will not end a tantrum. Zero to Three advises being calmly present.
- Name the feeling. The NHS suggests saying it plainly: “I know you’re feeling angry about…”. Zero to Three recommends validating the child’s feelings first and only then offering reassurance.
- Hold the limit while accepting the emotion. Zero to Three gives the example: “I will stop you from hitting.” The anger is fine; behaviour that hurts is not.
- Distract early on. If you see a tantrum just beginning, the NHS and the AAP suggest redirecting attention: point out something out of the window, change rooms, sing a song.
- Keep them safe. At home, the NHS suggests making sure the child cannot hurt themselves and then going into another room for a while. MedlinePlus adds that away from home it helps to move somewhere quiet, such as the car.
- Hold them if they need it. The NHS describes how some parents hold the child firmly until the tantrum passes, and says this works best when the child seems more upset than angry and the adult can stay calm.
- Talk once it is over. MedlinePlus advises discussing the situation calmly and offering alternatives only after the tantrum.
A tantrum in a shop is harder, because of the stares from strangers. The NHS advises ignoring onlookers and concentrating on staying calm, keeping shopping trips with a two-year-old short and involving the child: talking about what you are buying and letting them help.
What not to do during a tantrum
The most common mistake is giving in to make the tantrum stop. The NHS warns that turning a “no” into a “yes” teaches the child that tantrums work, and for the same reason advises against bribing with sweets. MedlinePlus puts it briefly: do not give in or break your own rules.
Other things the sources advise avoiding:
- Shouting and smacking. MedlinePlus stresses that shouting and hitting make things worse.
- Ignoring danger. The AAP warns against waiting out a tantrum if the child is at risk, for example near a road — then you need to hold them firmly.
- Questions with no real choice. Zero to Three and MedlinePlus advise against offering a choice that does not actually exist.
- Blaming yourself. MedlinePlus reminds parents that tantrums are not a sign of bad parenting or a “bad” child.
It also helps to keep an eye on where your attention goes. The CDC advises limiting attention for defiant behaviour such as tantrums, while teaching the child acceptable ways to show they are upset. If a parent uses a time-out, the CDC recommends keeping it very short and always showing or telling the child what to do instead. Setting limits without punishment is discussed in more depth in our article on punishments and rewards in Montessori.
Hitting, biting, kicking
Hitting, biting and kicking happen in many two-year-olds, but they need an immediate response. The NHS explains that toddlers are curious and may not realise that biting or pulling hair hurts. The AAP describes how a two-year-old who is stopped from overstepping a limit may hit, bite or kick.
How to respond, according to the sources:
- Stop it straight away. The AAP recommends a zero-tolerance policy for hitting, kicking, biting and throwing things — stop it at once and make it clear it is not allowed, for example by removing the child from the situation.
- Don’t hit back. The NHS warns that hitting back may teach the child that hitting is acceptable. Instead, say clearly that it hurts and will not be allowed.
- Look for the cause. The NHS notes that aggression can come from feeling upset or insecure, so it is worth finding out what is bothering the child.
- Give anger an outlet. Zero to Three suggests acceptable outlets: ripping paper, stomping feet, punching a pillow. The NHS recommends big spaces, such as a park, where the child can run and shout.
How to help a child name and release emotions is covered in our article on Montessori and emotional development.
How to survive the terrible twos without losing yourself
The terrible twos are exhausting for parents too, and the sources say so openly. The AAP reminds parents that some days are harder than others and not everything will get done, and that when frustration builds it is worth taking a break — for example handing the child over to the other parent or a friend for a while. Zero to Three encourages parents to separate themselves from the child’s behaviour and to model taking a break when they are angry — only, of course, when the child is safe.
A few things that help you get through this period:
- Agree on a few shared rules with your partner. A two-year-old copes more easily with limits that are the same whoever is at home.
- Build in extra time. Many morning outbursts come from rushing, as with Zosia in the opening scene.
- Ask for help. The AAP encourages parents to lean on family and friends to help them wait out tantrums.
- Remember it is a stage. The sources in the table agree that tantrums fade as language and self-control develop.
MedlinePlus also makes an important point: if you feel you are losing control of your anger and might resort to physical punishment, that is a signal to talk to a doctor. Asking for support in that situation is a sensible decision, not a failure.
Choices within limits — what the Montessori approach suggests
The Montessori approach has no separate “method for the terrible twos”, but its basic principles fit well with what paediatricians say. It comes down to three things: freedom within clearly defined limits, everyday independence and an environment prepared so that the child can manage without constant help from an adult.
Choices within limits. The adult sets the frame and the child chooses within it: “we’re going for a walk — do you want your wellies or your sandals?”. The AAP and Zero to Three recommend the same kind of small choices. The child feels they have a say, while the decision about the walk stays with the adult.
Independence. In Montessori education even very young children are taught everyday tasks: pouring water, wiping the table, putting things back in their place. For a two-year-old shouting “me do it!”, that answers the need instead of fighting it. The CDC gives the same advice for home: let the child dress and feed themselves. How to support independence in practice is covered in our article on Montessori and independence.
A prepared environment. A low coat hook, a step stool by the washbasin, a cup within reach — each change like this means one less situation in which a two-year-old has to ask for help and wait. Less frustration means fewer occasions for an outburst.
This approach does not replace medical advice; it complements it. A child who has real room for independence will still have bad days, but some of the battles over “me do it!” simply stop being necessary.
When do the terrible twos end?
The terrible twos end gradually rather than overnight, and at a different pace for each child. The AAP writes that tantrums usually improve after age three, although they do not disappear entirely. The NHS says they become less likely as the child talks more, and are far less common by the age of four.
According to MedlinePlus, tantrums happen less often between the ages of three and five and rarely after five. Zero to Three links this change to maturing impulse control, which usually lets a child stick to rules at around three and a half to four. The AAP adds that separations from a parent also usually become easier by about the third birthday.
Some children enter a new phase of defiance after their third birthday, with different challenges. How it differs from the terrible twos is covered in our article on tantrums in 3- and 4-year-olds.
When should you talk to a doctor?
Most tantrums in a two-year-old do not need a medical opinion, but there are signs worth discussing with a paediatrician. The medical sources mainly mention tantrums that are getting worse or are very frequent, a child hurting themselves or others, breath-holding with fainting, and other symptoms that come with the tantrums.
MedlinePlus advises contacting a doctor if:
- you cannot manage the tantrums, they are getting worse, or you are worried you might respond with physical punishment or cannot control your own anger and shouting,
- the child hurts themselves or others or damages things during tantrums,
- the child holds their breath during tantrums, especially if they faint,
- the tantrums come with nightmares, a setback in toilet training, headaches or stomach aches, anxiety, refusing to eat or sleep, or clinging to you,
- the tantrums get worse or happen often after the age of five.
The AAP adds signs related to a two-year-old’s mood: if the child seems very passive or withdrawn, persistently sad, or highly demanding and unsatisfied most of the time, it is worth talking to the paediatrician. The doctor may refer the child to a mental health specialist if needed.
The CDC also reminds parents that they know their child best. If a two-year-old is not reaching typical milestones, for example not putting two words together, or is losing skills they already had, do not wait — talk to the doctor about a developmental assessment. The NHS sums it up simply: if you are seriously concerned about your child’s behaviour, talk to a doctor. In Poland the first port of call is usually your child’s paediatrician (pediatra).
FAQ — parents’ questions about the terrible twos
When do the terrible twos start? According to the NHS, tantrums usually start at around 18 months, and the AAP writes that they most often occur between the ages of one and three. That is why the terrible twos often begin before the second birthday.
How long do the terrible twos last? There is no single answer. The AAP says tantrums usually improve after age three, and the NHS that they are far less common by age four. The pace depends on the child, above all on how quickly their language develops.
Does every child go through the terrible twos? The intensity varies a great deal. The AAP notes that some children have many tantrums and others few, and temperament plays a big part. The absence of an obvious rebellious phase is no cause for concern if the child is developing well.
Should I ignore tantrums? Not entirely. MedlinePlus says that if the child is safe and not destructive, you can leave the room and wait out the tantrum, then talk calmly afterwards. The AAP warns, however, against ignoring hitting, biting or situations in which the child is in danger.
Should I give my child what they want so they calm down? The NHS advises against turning a “no” into a “yes” or bribing with sweets, because the child then learns that tantrums work. It is better to hold the limit calmly and help the child ride out the emotions.
Do the terrible twos mean I am raising my child badly? No. MedlinePlus stresses that tantrums are normal and are not a sign of bad parenting or a “bad” child. The AAP adds that frequent tantrums do not mean you are giving your child too little attention.
Final thoughts
The terrible twos are a clash between a huge desire for independence and abilities that are still small: the child wants more than they can manage and feels more than they can say. What helps most is a steady daily rhythm, small choices, calmly holding limits and plenty of chances to do things on their own. Tantrums fade as language and self-control develop, and when something worries you, a conversation with the paediatrician helps to separate an ordinary stage from a signal that needs attention.
And Zosia from the morning scene? The next day her mum got up ten minutes earlier and said: “You fasten your shoes, and I’ll get the keys in the meantime.” The strap fastened on the third try, and they left the house without tears. It will not always go like that, but mornings like this become more frequent over time.
If you are wondering what a day looks like for two-year-olds in a nursery group, take a look at the nursery page (in Polish).