Separation anxiety: peaks, normal range, and what helps

Around 6 to 8 months, many babies who were previously quite content to be held by different people or left briefly in a safe space begin to protest intensely when a parent leaves the room. This is separation anxiety, and it is one of the more exhausting phases of early infancy — but it is also a developmental milestone, not a problem.

Why separation anxiety happens

The timing of separation anxiety is not coincidental. It tracks closely with the development of object permanence — the understanding that people and things continue to exist when they are out of sight.¹ Before this cognitive shift, you leaving the room is a neutral event. After it, you leaving the room means you exist somewhere else — and might not come back.

This is developmentally healthy. A baby who shows separation anxiety has understood something true: that you are a separate person who can go away. Their distress is an appropriate emotional response to that understanding, filtered through a brain that has no concept of "back in five minutes."

For context, see Object permanence and cognitive leaps.

When it typically peaks

Separation anxiety usually begins around 6–8 months, peaks somewhere between 8 and 18 months, and gradually decreases through the toddler years as the child develops a more stable internal model of you as someone who reliably returns.¹²

It can resurface at other points — around 18 months when toddlers hit a second wave of intensity, at transitions like starting nursery, or during illness and periods of change. These recurrences are normal.

The range is wide. Some babies show intense separation anxiety from 7 months; others show a mild version that peaks around 12 months. Intensity within the range is not a measure of the strength of the parent-child bond — it is more a measure of the individual baby's temperament and sensitivity.

What helps during the peak

Brief practice separations. Short, predictable separations — stepping out of the room for a minute and coming back — help build the baby's experience that you leave and return. Start very short and build gradually. The goal is not to expose the baby to distress, but to accumulate evidence that separation has a reliably happy ending.

Consistent goodbyes. Saying a clear, warm goodbye before leaving — even when the baby protests — is better than slipping away without warning. The short-term distress of the goodbye is outweighed by the longer-term predictability it creates. Babies who are used to being warned about departures manage them better over time than those who experience sudden disappearances.²

Do not sneak out. Sneaking away when the baby is distracted avoids the immediate goodbye distress but erodes trust in the environment's predictability. If you can disappear without warning once, you can again at any moment. The baby who cannot track whether you are really there or might have vanished will be more anxious, not less.

Staying close at handovers. When leaving your baby with another caregiver — a partner, grandparent, or childminder — your calm and matter-of-fact manner at the handover communicates whether the situation is safe. A parent who is visibly anxious at leaving amplifies the baby's distress.

Returning to nursery or childcare

Separation anxiety often intensifies around the time children start nursery or another childcare setting — typically 9–12 months in the UK. Most children adjust within a few weeks of a consistent settling-in process. Distress at drop-off that resolves within minutes of a parent leaving is typical and does not indicate the child is unhappy in the setting.

When to seek support

Separation anxiety that persists well past 18–24 months with significant intensity, that prevents the child from functioning in age-appropriate settings, or that is accompanied by other concerning signs (developmental regression, significant changes in eating or sleep, unusual fearfulness across multiple contexts) is worth discussing with your GP or health visitor.¹²

For most children, the intensity simply diminishes as language develops and the child accumulates enough experience of reliable returns to trust the world.

← Back to the overview: Child development overview

Also in this cluster: Object permanence and cognitive leaps · Stranger anxiety

Sources

1. NHS. "Separation anxiety." NHS, 2024. https://www.nhs.uk/conditions/baby/babys-development/learning/separation-anxiety/
2. American Academy of Pediatrics. "Separation Anxiety." HealthyChildren.org, 2024. https://www.healthychildren.org/English/ages-stages/toddler/Pages/Separation-Anxiety.aspx