Separation Anxiety in Babies and Toddlers: A Pediatrician's Guide to What's Normal and How to Help

Separation anxiety is a normal, healthy stage of development - not a problem to fix. It usually starts between 6 and 12 months, peaks between 10 and 18 months, and for most children eases by about age 3. When your baby cries the moment you leave the room, it's a sign they have formed a strong, healthy bond with you.

Most parents who search for this are worried that a suddenly clingy baby means something is wrong. It almost never does. This guide walks through when separation anxiety starts, why it happens, how to help, and the small number of signs that are worth a conversation with your pediatrician.

"In our telehealth visits, one of the most common worries we hear from parents of 9- to 18-month-olds is that their once-easygoing baby now cries the moment they leave the room. This is almost always a normal, healthy stage - not a sign that anything is wrong."

- Dr. Melissa Tribuzio, MD, Board-Certified Pediatrician

What is separation anxiety in babies and toddlers?

Separation anxiety is the distress a baby or toddler feels when apart from the person they're most attached to. It's a normal, expected stage - a sign of healthy bonding, not a behavior problem.

Your baby feels it once two things click into place. First, they learn about object permanence - the understanding that people and things still exist even when your baby can't see them. Second, they know that you specifically, not just any kind adult, are the person they want. That's a bond forming right on schedule.

Separation anxiety is a normal sign that your baby knows exactly who you are and wants you close. Babies show it in very different amounts. A baby who protests loudly and a baby who barely reacts can be equally, securely attached. How much your baby cries at goodbye does not measure how strong the bond is - their personality plays a big role.

Stranger anxiety is related but different. That's wariness of unfamiliar people, and it can happen even while your baby is safe in your arms. Separation anxiety is triggered by your leaving. The two often show up around the same time.

When does separation anxiety start, peak, and end?

Separation anxiety usually starts between 6 and 12 months, peaks between 10 and 18 months, and mostly fades by about age 3. Some babies start earlier, and some toddlers hit it for the first time later.

Here's the fuller picture, true to the leading pediatric sources. Some babies show early signs as young as 4 to 5 months. It peaks between 10 and 18 months. From there it eases steadily through the second year, and for most children it's mostly gone by age 3. Some children skip it as babies and hit it for the first time as toddlers, around 15 to 18 months. Brief flare-ups when something changes - a new daycare, a move, a new sibling - are normal well into the preschool years.

When it starts (around 6 to 12 months)

Most babies start showing separation anxiety between 6 and 12 months. Some show early signs as young as 4 to 5 months. This is when your baby is working out that you still exist after you leave the room - and that they can't follow you yet.

When it peaks (usually 10 to 18 months)

The most intense stretch is usually between 10 and 18 months. Your toddler can now walk away from you, but doesn't yet have the words or the self-calming skills to handle being left. Big goodbyes bring big feelings.

When it fades (usually by around age 3)

Separation anxiety eases as your child grows. Language, memory, and a sense of time all develop, and "back after your nap" starts to actually mean something. For most children it's mostly gone by about age 3, with brief flare-ups around big changes.

Ages here are approximate - every child is a little different. This timeline shows what's typically going on at each stage.

The CDC lists "reacts when you leave (looks, reaches for you, or cries)" as a typical milestone by 9 months. These checklists describe what most children do by a given age - they are not a schedule your child is supposed to hit.

Why does separation anxiety happen?

Separation anxiety happens because your baby's brain has grown. They now know you still exist when you leave, they have no sense of time, and they rely on you to feel safe. All three arrive together around the same age.

Three things are going on, in the order that makes sense to a parent:

1. Object permanence. Your baby has figured out that you still exist when you're out of sight. Before that, out of sight was truly out of mind - no one to miss. Now there's someone to miss, and no way to reach them. This ability builds gradually over the first year and becomes obvious around 8 to 12 months, when babies start hunting for things they've seen you hide.
2. No sense of time. Babies and young toddlers have no concept of how long anything lasts. "Back in ten minutes" and "gone forever" feel exactly the same. This is why an apparently over-the-top meltdown is actually a very reasonable response to the only information your baby has.
3. You are their safety system. Babies can't yet calm themselves down. They borrow your calm. When the person who does their soothing walks out, the alarm goes off.

Your baby's temperament explains most of why one child protests far more than another. Some babies are simply louder about big feelings - it doesn't mean they're struggling more.

What are the signs of separation anxiety?

Common signs include crying and clinging at goodbyes, following you from room to room, new night waking, and refusing familiar caregivers. All of these are normal between about 6 months and age 3.

Here's what typically shows up:

• Crying, clinging, or a full tantrum when you say goodbye
• Following you from room to room, and getting upset when you're out of sight even briefly
• Waking at night and crying for you, often after a stretch of sleeping well
• Fighting bedtime, or needing you in the room to fall asleep
• Refusing a familiar babysitter, grandparent, or even the other parent - sometimes strongly preferring one parent
• Settling within minutes once you've gone and a caring adult takes over - and calming quickly when you return

That last one matters most. A baby who is upset at goodbye but settles soon after, and lights up when you come back, is doing exactly what a securely attached baby does.

Night waking is one of the most common signs, because bedtime is the longest separation of the day. This kind of night waking often settles around the second birthday, though the daytime phase can continue to about age 3. If night wakings are your main concern, our toddler sleep regression guide covers the bedtime side in more detail.

How can I help my baby or toddler with separation anxiety?

You can help by making separations predictable: say goodbye every time, use the same short ritual, stay calm, and practice short separations. These don't stop the crying today - they shorten the phase over time.

None of these strategies make the tears disappear on the spot. What they do is make leaving and coming back predictable, which is what helps your child move through the phase. Try these:

1. Always say goodbye - never sneak out. This is the most important one. Sneaking out teaches your child to watch you constantly, because you might vanish at any moment. Say goodbye, keep it short, then go.
2. Use the same short goodbye ritual every time. A quick hug, a wave at the window, or a kiss in each other's palm to "hold" all day. Something concrete and repeatable works best.
3. Keep it short and stay calm. Lingering or coming back for one more hug signals there's something to fear. A brief, upbeat goodbye helps children settle faster.
4. Practice short separations. Start with another room, then a short errand with a trusted adult. Your child learns the pattern: you leave, you come back.
5. Keep promises about coming back - in child time. Say "after your nap" or "after snack" instead of clock time. It matches how your child actually experiences the day.
6. Keep routines predictable. Children accept separation more easily when it's part of a familiar routine.
7. Time departures around naps and meals. Hungry and tired make everything harder.
8. Let a comfort object help - outside the crib. A small blanket or stuffed animal can be a comfort at drop-off and during the day, but keep it out of the crib until your baby's first birthday.

One more thing: separation anxiety is a normal stage of growing up, not misbehavior. There's nothing to punish or "train out." Responding to your clingy baby doesn't spoil them - it builds the trust that independence grows from later.

How do I handle daycare drop-off?

Use the same ritual and the same drop-off adult each day, and give the caregiver time to get to know your child. Expect a tired, clingy child in the early evenings for the first couple of weeks, and give it about three weeks before judging how it's going.

Settling into daycare is genuinely hard work for a toddler, and there's research that shows it. In one study of 113 toddlers, stress-hormone levels rose over the first two weeks in childcare. They peaked around day nine. By week three they were falling, and by three months they were back to where they started. Across this research, two things seem to help most: a warm, consistent caregiver who gets to know the child, and a parent who keeps goodbyes calm and confident. The hard part is real - and it's the beginning of the adjustment, not the shape of it.

A few practical points that follow from this:

• Phase in the start slowly if your childcare setting allows it.
• Keep the same drop-off adult and the same ritual every day.
• Give the main caregiver time to build a relationship with your child.
• Expect an unusually tired, clingy child in the early evenings for the first couple of weeks.
• Give it about three weeks before judging how it's going.

Your own calm matters more than it feels like it should. A parent's stress at drop-off tends to track with the child's stress across the day. Acting calm and confident, even when you don't feel it, really does help.

Normal separation anxiety vs. separation anxiety disorder: how to tell the difference

Separation anxiety disorder is a diagnosable condition - but it's uncommon, and it usually shows up in school-age children, not babies and toddlers. The normal phase is intense but brief, and it doesn't stop a child from playing, eating, or being comforted.

The disorder is diagnosed when the fear is far more intense than expected for the child's age. It lasts at least four weeks and gets in the way of everyday life - school, sleep, friendships, and family routines. For a baby or toddler in the normal phase, the crying is intense but short-lived. It doesn't keep them from playing, eating, or settling with a caring adult. The disorder is uncommon. Only a small number of children - roughly 4 in 100 - have it. And it typically first appears around age 6, not in the baby and toddler years.

If you'd like to read more about anxiety signs in young children, see The Quiet Clues: Anxiety Symptoms Parents Might Miss in Children 0–12.

When should you talk to a pediatrician about separation anxiety?

Most children never need this conversation, and having it doesn't mean anything is wrong. But a pediatrician can help if your child's distress is severe, lasts more than four weeks, and keeps them from everyday life.

Reach out for peace of mind first, and evaluation second. Talk to your pediatrician if:

• Your child's distress lasts more than four weeks and keeps them from daycare, sleep, or play.
• Your child has stomachaches, headaches, or vomiting before or during separations.
• Your child cries for hours at drop-off and a caregiver can't comfort or redirect them.
• The separation anxiety keeps getting stronger after age 3 instead of easing, or appears suddenly in an older child who was fine before.
• Your child refuses to be alone in a room, or won't sleep unless you're right there, and it's been going on for weeks.
• You're simply worried and want a professional's read.

A normal developmental phase doesn't require a visit. But if you're unsure whether what you're seeing is the normal phase or something more, a pediatrician can help you tell the difference. Blueberry Pediatrics gives you 24/7 access to a pediatrician for reassurance and triage - a fast, convenient first conversation, and a referral if your child needs more support.

Frequently asked questions

What is separation anxiety in babies and toddlers?

It's the distress a baby or toddler feels when apart from the person they're most attached to. It's a normal stage that starts once babies understand you still exist when they can't see you.

At what age does separation anxiety start?

Usually between 6 and 12 months. Some babies show early signs at 4 to 5 months, and some children first show it as toddlers, around 15 to 18 months.

When does separation anxiety peak?

Between 10 and 18 months.

When does separation anxiety go away? How long does it last?

It eases through the second year and is mostly gone by about age 3, with brief flare-ups around big changes like a move or a new sibling.

Why does my baby get so upset when I leave the room?

Your baby now knows you still exist somewhere else - but has no sense of how long "back in a minute" is. To them, leaving and never coming back feel the same.

What does object permanence have to do with separation anxiety?

Object permanence is understanding that people and things still exist when your baby can't see them. Once your baby has it, your leaving becomes something to miss and protest. It builds over the first year and is obvious by 8 to 12 months.

Should I sneak out or say goodbye?

Always say goodbye. Sneaking out teaches your child to watch you constantly in case you disappear, which makes the anxiety worse. Say goodbye, keep it short, then go.

How do I handle separation anxiety at daycare drop-off?

Use the same ritual and the same person each day, and give the caregiver time to build a relationship with your child. Expect a tired, clingy child in the early evenings for the first couple of weeks, and give it about three weeks before judging how it's going.

Is separation anxiety at night or bedtime normal?

Yes. Bedtime is the longest separation of the day. Night waking from separation anxiety often settles around the second birthday, though the daytime phase can continue to about age 3. See our toddler sleep regression guide for the bedtime side.

What is the difference between normal separation anxiety and separation anxiety disorder?

The disorder is uncommon, usually appears at school age, lasts at least four weeks, and interferes with everyday life. The normal phase is intense but brief and doesn't stop a child from playing, eating, or being comforted.

Is separation anxiety a sign of a healthy attachment?

Yes. It means your baby knows exactly who you are and wants you close. Babies show it in very different amounts, and a baby who shows little of it is just as likely to be securely attached.

Related reading

• Infant developmental milestones by month
• 6-month-old developmental milestones: a pediatrician's guide
• Understanding toddler sleep regression: a pediatrician's guide for new parents
• The Quiet Clues: Anxiety Symptoms Parents Might Miss in Children 0–12

Sources

• American Academy of Pediatrics (AAP), HealthyChildren.org - "How to Ease Your Child's Separation Anxiety" (updated May 2026); "Separation Anxiety & Sleeping Trouble"; "Making Baby Drop-Off at Child Care Easier."
• AAP Safe Sleep policy - Moon RY, Carlin RF, Hand I, AAP Task Force on SIDS. Pediatrics. 2022;150(1):e2022057990.
• Centers for Disease Control and Prevention (CDC) - Developmental Milestones by 9 Months and by 18 Months.
• StatPearls / NIH National Library of Medicine - "Separation Anxiety Disorder" (NBK560793, updated June 2026).
• Children's Hospital of Philadelphia (CHOP) - "Separation Anxiety: What's Normal and When to Worry."
• Stanford Medicine Children's Health - "Separation Anxiety Disorder in Children."
• Boston Children's Hospital - "Separation Anxiety Disorder."
• Cleveland Clinic - "Separation Anxiety in Babies."
• Zero to Three - "Separation Anxiety."
• Drugli MB, Nystad K, Lydersen S, Brenne AS. "Do toddlers' levels of cortisol and the perceptions of parents and professional caregivers tell the same story about transition from home to childcare?" Frontiers in Psychology. 2023;14:1165788.

This article is for general education and is not a substitute for medical advice from your child's pediatrician.