When it appears, and how long it lasts
The usual pattern runs something like this. Worry when a parent goes out of sight tends to begin around six months. Clinginess and protest at being put down or left run through the toddler years, often peaking somewhere between about ten and eighteen months. Difficulty at nursery or playgroup drop-off is common through the pre-school years, and most children have some reluctant mornings when they start school.
It does not necessarily arrive once and go. It commonly returns after a child has apparently settled, and it reappears around upheaval — a new baby, a house move, a change of room or key person at nursery, a spell of illness, tension at home, a holiday that disrupted the routine. A child who managed drop-off happily for a term and then stops is not going backwards so much as responding to something.
For most children it fades with age. For some it persists through childhood, and for a few it first appears later, in the teenage years, usually as the pull towards independence collides with the worry that comes with it.
Why it happens
Two developments arrive at roughly the same time and together produce the effect.
The first is the capacity to hold in mind someone who is not in the room. A young baby is largely occupied by what is present; by the second half of the first year, a baby can keep an absent parent in mind, notice the absence, and anticipate it. That is a substantial cognitive step, and the protest is in a sense its by-product — a baby cannot miss someone it cannot yet represent.
The second is that by around six to eight months most babies have formed strong attachments to a small number of specific people, rather than being content with competent care from anyone. Protest at separation from those particular people is the expected behaviour of a securely attached baby, not a sign of insecurity. This is the part that older writing on the subject tends to get backwards.
What a baby has not yet developed is any sense of duration. An absence of twenty minutes and an absence of a whole morning are not meaningfully different to a one-year-old, which is why reassurance about time only starts to work once a child can anchor it to events.
What helps
Most of what works is unglamorous and consists of rehearsal and consistency.
- Practise short separations at home. Going into another room and talking from there, and coming back, builds the experience of absence followed by return in conditions where nothing much is at stake.
- Peek-a-boo and hide-and-seek do the same job in play. A game whose entire content is disappearance and reappearance is not a coincidence.
- Keep the circle of carers small and familiar. Frequently changing who looks after a baby is specifically listed as something to avoid; meeting a new carer several times before being left with them is worth the arrangement it takes.
- A comfort object — a particular teddy, a muslin, a piece of a parent's clothing that smells right — carries real weight at this age and is worth taking along rather than discouraging.
- Anchor the return to an event, not a clock. Back after lunch, or after the afternoon sleep, means something to a toddler where two hours does not. Being back when promised is the part that does the work.
- Stories about nursery or school, and talking through what the day will contain, make the unfamiliar a little less so.
The goodbye itself
Slipping out while a child is distracted is tempting and is the wrong move. It converts a predictable, survivable event into something that can happen without warning at any moment, which tends to make a child more watchful rather than less.
The approach that works is a short, warm, definite goodbye, repeated the same way each time — and then leaving. A goodbye routine that is the same every day, with the same words or the same wave at the same window, gives a child something to hold on to. Drawing it out, returning to check, or reappearing a second time after the child has begun to settle usually produces a second round of distress and teaches that enough crying brings a parent back.
Most children settle within a few minutes of the door closing, which parents standing outside it have no way of knowing. Phoning the setting fifteen or twenty minutes later is the sensible way to resolve that, and any decent nursery or childminder expects the call and will not mind it.
Childcare, settling in and the key person
This is where UK practice gives parents more to work with than most advice acknowledges.
Every early years setting in England, nurseries and childminders alike, is required under the statutory framework to assign each child a key person: a named individual responsible for that child's settling in, for building a relationship with them, and for being the point of contact for the family. Asking who the key person is, meeting them before the first session, and talking to them directly about what helps a particular child is using the system as designed rather than making a fuss.
Settling-in sessions are the other mechanism. A sequence of short visits, with a parent present at first and then briefly absent, is standard practice and is not a favour. A setting that resists arranging them is telling a parent something useful about itself.
It is also worth raising difficulty early rather than waiting to see whether it passes. Staff who know that a child has been waking at night, or that a grandparent has just gone home, can respond to the mornings differently.
Two pieces of older advice to set aside
Delaying childcare until the window passes. Older writing commonly advised against starting a new childcare arrangement between about eight months and a year, on the grounds that this is the sensitive period. In practice parents return to work when they return to work, the advice is largely unactionable, and it mostly supplies guilt. The better framing is that the arrangement matters more than the timing: a small number of consistent carers, proper settling-in, and a named key person do more than waiting for a calendar.
Avoiding the thing the child finds hard. This is the more important correction. Steering around separations because they go badly brings relief in the moment and tends to entrench the anxiety, because the child never accumulates the experience of being left and collected again. Gradual, predictable, repeated practice is what shifts it.
Bedtime
Separation anxiety and bedtime resistance overlap heavily, and a child who has started protesting at being left in a room alone at night is often working through the same thing in a different setting. That is covered under bedtime and night fears in children, and for the first year under babies' sleep in the first year.
When it is more than a stage
The great majority of separation anxiety needs patience rather than intervention. There is a point, though, at which it is worth asking for help, and the threshold is less about how loud the distress is than about what it is preventing.
Worth a conversation with a health visitor or GP:
- Distress that is severe and persistent over months rather than easing with familiarity.
- Anxiety that is stopping a child doing ordinary things — sleeping in their own bed, staying with a grandparent, going to nursery or school at all.
- Physical symptoms that cluster around separations: stomach aches, headaches or sickness on school mornings that resolve when the child stays at home.
- Persistent fear that something bad will happen to a parent while they are apart.
- Anxiety that appears for the first time well outside the usual window, or after a frightening event.
Where school attendance is becoming a problem, contacting the school early matters, because the longer a pattern of absence establishes itself the harder it is to unwind. Charities including YoungMinds run helplines for parents, and a health visitor or GP can refer onward where more than reassurance is needed.
Finally, the NHS guidance makes one point that is easy to overlook: children read the adult's state accurately. A parent who is visibly anxious at the door, or audibly frustrated by the clinging, hands the child more to be worried about. Appearing calm and unbothered at drop-off is often an act, and it is a useful one.