Separation Anxiety in Babies and Toddlers

Separation anxiety depends on object permanence, the understanding that things still exist when they are out of sight, which develops from around four to five months. Before that a parent who leaves the room has not gone anywhere, because there was no persisting idea of them to lose.

This is why it appears when it does rather than gradually from birth, and why it arrives at roughly the same time as looking for a dropped toy, which is on the same nine-month list. Both are the same new ability pointed at different objects, and one of them happens to be you.

It becomes pronounced at around nine months, which is the first peak and the one that surprises families, because a baby who was happily passed around at six months is suddenly not.

Then it comes back. Toddlers often experience peaks at fifteen to eighteen months, and preschoolers show a renewed awareness of separations by around age three. That second wave is the counterintuitive one: it arrives alongside growing independence rather than instead of it, because a child who can walk away from you is also a child who has noticed the distance.

Knowing there are peaks rather than a single phase to be got through is worth more than any technique on this page. Families who think they have failed at nine months are usually just meeting the next one.

The AAP's advice here is specific and it cuts against instinct. Create a quick goodbye ritual and keep it the same every time. Give your child your full attention, be affectionate, and then say goodbye quickly.

The instinct being resisted is lingering. A long goodbye does not use up the distress, it extends the period in which distress is the appropriate response, and it teaches your child that crying makes the leaving take longer.

Practising helps, and it is best done before it is needed. Short separations at home, with someone your child knows, in the weeks before a nursery start or a return to work, mean the first real separation is not also the first ever one.

• Same ritual every time, and keep it short
• Full attention first, then go
• Say when you are coming back in your child's units: after nap time, not at three o'clock
• Practise short separations before you need long ones

Coming back mid-separation to check is the first, and the AAP names it directly. Returning to visit extends the anxiety and means starting the whole separation again, because your child learns that the goodbye was not real and the next one may not be either.

Cancelling because of the distress is the second. Plans dropped because a child cried at the door teach that crying at the door works, and the cost lands on the next attempt rather than this one. Consistency is doing the leaving you said you would do, not being unmoved by it.

Slipping out unseen is a third that parents reach for and that belongs with these rather than as an alternative to them. It avoids the scene at the cost of the thing that eventually solves this: the repeated experience of a goodbye followed by a return.

Bedtime is a separation, and a nine-month-old who has just worked out that you persist when absent will apply that discovery to the dark as readily as to the front door. This is one reason the sleep disruption people report around eight to ten months lines up with this milestone rather than being a coincidence.

It usually settles as the skill becomes ordinary, and the same principles apply: a consistent short routine, a definite ending, and no returning for a visit after you have said goodnight. Our guide to sleep regressions covers the ages these disruptions cluster around and what else drives them.

The AAP's own line is that it is rare for separation anxiety to persist on a daily basis after the preschool years, so a child who is still distressed daily by separations at that age is worth mentioning to your paediatrician.

Before then, the thing to raise is not intensity but adaptation. A child who is upset at drop-off and settles within a reasonable time is doing the normal thing. A child who is not adapting at all over weeks, or whose distress prevents eating, sleeping or being cared for by anyone else, is a checkup conversation.