Anxiety in Children Under 5: What Parents Need to Know

Anxiety in children under five is
both more common and more commonly
missed than most parents realize.
It is missed because very young children
cannot say “I feel anxious” — they
say their tummy hurts, they cling,
they cry, they refuse, they melt
down. And it is missed because many
anxiety presentations in this age
group look like typical toddler behavior —
and distinguishing between the two
requires specific knowledge.

This article covers what anxiety
actually looks like in children under
five, what is developmentally normal
versus what warrants attention, and
what the research shows parents can
do to support very young anxious children.

Understanding Anxiety in Very
Young Children

Research on anxiety in early childhood —
including work by Harriet Seifer
at the University of Rochester
and by Ronald Rapee at Macquarie
University — finds that anxiety
in children under five is real,
recognizable, and significantly
more common than clinical referral
rates suggest.

Research on emotional development
in early childhood finds that the
capacity to experience anxiety —
the fear response, the threat-detection
system, the attachment-based distress
at separation — is present from
very early in life. What is absent
in children under five is the cognitive
and language capacity to understand,
label, and communicate what they
are experiencing.

This means that anxiety in very
young children is expressed almost
entirely through behavior and physical
symptoms — not through words.

What Is Developmentally Normal
Anxiety Under Five

Research on fear and anxiety development
in early childhood identifies a
range of age-appropriate anxieties
that are a normal part of development:

Birth to 12 months:
Startle responses to loud sounds.
Distress at separation from
primary caregivers — beginning
around six to eight months
as attachment develops.
Stranger anxiety — wariness
of unfamiliar people — beginning
around eight to ten months.

Ages 1-2:
Separation anxiety — intense
distress at separation from
attachment figures. Research
finds separation anxiety peaks
between twelve and eighteen months
and is entirely developmentally normal.
Fear of loud noises, sudden movements.
Distress at changes in routine.
Stranger wariness continuing.

Ages 2-3:
Separation anxiety typically
beginning to ease — though
still present and normal.
Emerging fears of animals,
darkness, imaginary creatures.
Distress at new situations
and transitions.
Fear responses to medical procedures.

Ages 3-5:
Fears of the dark, monsters,
imaginary threats.
Beginning fears of natural
events — thunder, lightning.
Social wariness in new situations.
Some performance anxiety beginning.

Research finding: These age-appropriate
fears and anxieties are a
normal part of development —
reflecting the child’s developing
cognitive capacity to perceive
threat, combined with limited
capacity to evaluate it realistically.
They do not constitute an
anxiety disorder and do not
require clinical intervention.

What Moves From Normal to Concerning

Research on anxiety in early childhood
identifies several features that
distinguish typical developmental
anxiety from anxiety that warrants
closer attention:

Intensity — significantly more
intense than same-age peers.
The child whose separation
distress at preschool drop-off
is significantly more extreme
than classmates — who takes
significantly longer to settle,
who shows more physical symptoms —
may be showing anxiety beyond
the typical range.

Duration — persisting beyond
the typical developmental window.
Stranger anxiety that is still
significantly present at age
three. Separation anxiety that
is still significantly impairing
at age four. Anxiety that
is not easing as it typically
would is worth monitoring more closely.

Pervasiveness — present across
multiple situations and relationships.
Anxiety that is present in
a single, specific context
is different from anxiety
that pervades multiple aspects
of the child’s daily life.

Impairment — significantly affecting
daily functioning. Anxiety
that prevents preschool attendance,
that significantly disrupts
sleep, that prevents participation
in typical activities, or that
significantly disrupts family
functioning warrants professional attention.

What Anxiety Looks Like in
Children Under Five

Research on anxiety presentations
in early childhood identifies
the specific ways anxiety expresses
at this developmental stage:

Physical symptoms:
Stomachaches — particularly
before anticipated stressful
events like preschool, medical
appointments, or social situations.
Headaches — less common than
stomachaches but present in
some anxious young children.
Nausea and vomiting — in
more acute anxiety situations.
Sleep difficulties — difficulty
falling asleep, frequent night
wakings, nightmares, resistance
to sleeping alone.
Fatigue — the exhausting physiological
arousal of chronic anxiety
produces genuine tiredness.

Behavioral presentations:
Clinging — intense, persistent
clinging to primary caregivers
that goes beyond what is typical
for the developmental stage.
Crying — prolonged, intense
crying in response to separation,
transitions, or new situations.
Freezing — inability to engage
with new people or situations,
appearing frozen or shut down.
Refusal — refusing to engage
with preschool, social situations,
or new experiences.
Regression — returning to
earlier behaviors such as
thumb-sucking, bedwetting,
or baby talk during periods
of anxiety.
Tantrums — research finds
that anxiety in very young
children is frequently expressed
through tantrums and behavioral
dysregulation rather than
through visible fear.
Reassurance-seeking — repeatedly
asking where the parent will
be, when they will return,
whether they will be okay.

Emotional presentations:
Visible fear — wide eyes,
pale face, trembling — in
response to specific triggers.
Irritability — research finds
that anxiety in very young
children frequently presents
as irritability rather than
visible fear.
Sadness — some anxious young
children show low mood alongside anxiety.

What Causes Anxiety in Children Under Five

Research on the causes of early
childhood anxiety identifies several
consistent factors:

Temperament. Research on behavioral
inhibition — the temperamental
tendency toward fearfulness
and caution — finds it present
from infancy and one of the
strongest predictors of early
childhood anxiety. Research
by Jerome Kagan finds that
approximately fifteen percent
of infants show behavioral
inhibition — and that this
group shows elevated anxiety
rates across childhood.

Attachment security. Research
on attachment and anxiety finds
consistent relationships —
children with insecure attachment
show higher rates of anxiety
than those with secure attachment.
The quality of the early caregiving
relationship is one of the
most modifiable risk factors
for early childhood anxiety.

Parental anxiety. Research
on the transmission of anxiety
from parent to child finds
that parental anxiety — particularly
maternal anxiety — is one
of the strongest predictors
of early childhood anxiety,
through both genetic transmission
and through the modeling of
anxious responses to the world.

Adverse experiences. Research
on adverse childhood experiences
and anxiety finds that early
stressors — family disruption,
parental mental health difficulties,
exposure to frightening events —
significantly increase anxiety
risk in very young children.

What the Research Shows Helps

Secure, responsive caregiving.
Research consistently finds
that the most powerful protective
factor against early childhood
anxiety is secure attachment —
the experience of a consistently
warm, responsive, available
caregiver who reliably soothes
distress and provides felt safety.
This is both the most natural
and the most evidence-based
intervention for anxiety in
children under five.

Gradual, supported exposure
to new situations. Research
on anxiety and avoidance in
early childhood finds that
gradually and supportively
introducing very young children
to new situations — rather
than avoiding them — reduces
anxiety over time. The parent
who stays nearby while the
child explores a new situation,
who provides warm encouragement
for small brave steps, is
building approach confidence
rather than avoidance patterns.

Consistent, predictable routines.
Research on early childhood
anxiety and environmental predictability
finds that consistent, predictable
daily routines significantly
reduce anxiety in very young
children — because predictability
reduces the uncertainty that
anxiety feeds on.

Warm, calm parental responses
to anxiety. Research on parental
responses to early childhood
anxiety finds that warm, calm,
matter-of-fact responses to
the child’s anxiety — acknowledging
the feeling without amplifying
it — produce better outcomes
than either dismissing the
anxiety or responding with
parental alarm.

“I can see that feels scary.
I’m right here. You’re safe.”

Reducing accommodation gradually.
Research by Lebowitz on family
accommodation and childhood
anxiety finds that accommodation —
structuring family life around
the child’s anxiety to prevent distress —
maintains anxiety even in
very young children. Gradual,
warm reduction of accommodation —
appropriate to the child’s
developmental stage — is more
effective than indefinite accommodation.

What Does Not Help

Forcing exposure without support.
Research on very young children
and anxiety finds that sudden,
unsupported exposure to overwhelming
situations — leaving a clingy
child abruptly in a new environment
without transition support —
is not effective and can damage
the attachment relationship
that is the most important
protective factor.

Excessive reassurance. Research
on reassurance and anxiety
finds that excessive parental
reassurance — repeated and
abundant — maintains rather
than reduces anxiety even
in very young children. Brief,
warm acknowledgment and encouragement
is more effective than repeated reassurance.

Dismissing the anxiety. Research
on emotional validation and
early childhood anxiety finds
that dismissing or minimizing
the very young child’s anxiety —
“there’s nothing to be scared of” —
increases rather than decreases
the anxiety by communicating
that the child’s experience
is not understood or taken seriously.

When to Seek Professional Assessment

Professional assessment is recommended when:

Anxiety is significantly impairing
the child’s daily functioning —
preventing preschool attendance,
significantly disrupting sleep,
preventing participation in
typical activities.

Anxiety is not easing with
consistent, warm parental support
over four to six weeks.

Anxiety is significantly more
intense or more pervasive than
same-age peers.

You are uncertain whether
what you are seeing is typical
development or something that
warrants professional attention.

The child is showing significant
regression or other developmental concerns alongside the anxiety.

A pediatrician is the right
first conversation — who can
rule out medical causes of
symptoms and provide referrals
to appropriate support.

Research on early intervention
for childhood anxiety finds
that parent-based interventions —
approaches that work primarily
through coaching parents in
anxiety-reducing responses —
are the most appropriate and
effective interventions for
children under five.

Try This This Week

Practice 1 — The Brave Step Support
What it is: A deliberate
daily practice of gently and
warmly supporting one small
brave step — building approach
confidence in a very young anxious child.

How to do it: Identify one
situation that your child
currently avoids or finds
difficult. This week — approach
the easiest version of that
situation together:

Stay close — within sight
and reach.
Provide warm, calm encouragement:
“I’m right here. You can try.”
Celebrate the brave step genuinely:
“You did it! That was so brave.”

Keep the step very small —
the goal is one small success,
not a complete resolution.

Why it works: Research on
anxiety and approach behavior
in early childhood finds that
small, supported, successful
approach experiences — accumulated
over time — build approach
confidence and reduce avoidance
patterns more effectively
than either forced exposure
or continued avoidance.

Practice 2 — The Calm Presence Practice
What it is: A deliberate practice
of providing warm, calm, regulated
presence during your child’s
anxiety — offering the co-regulation
that research finds most effective.

How to do it: When your child
shows anxiety — clinging, crying,
freezing — practice the calm presence response:

Get down to their physical level.
Make gentle physical contact —
a hand on the back, a hug —
if the child welcomes it.
Speak calmly and slowly:
“I’m here. You’re safe. It’s okay.”
Breathe slowly and visibly —
your regulated breathing helps
regulate theirs.
Stay present until the anxiety eases.

Why it works: Research on
co-regulation and early childhood
anxiety finds that the calm,
regulated presence of a trusted
caregiver is the most effective
immediate intervention for
anxiety in very young children —
because the child’s immature
regulatory system borrows
regulation from the caregiver’s
regulated nervous system.

Practice 3 — The Predictable Routine Builder
What it is: A deliberate strengthening
of one daily routine — building
the predictability that research
finds powerfully protective
against early childhood anxiety.

How to do it: Choose one
daily routine that is currently
inconsistent — morning, bedtime,
preschool drop-off — and make
it consistent and predictable
this week:

Same sequence of steps every day.
Same timing where possible.
Same warm, reassuring language
at key transition points.
Same goodbye ritual at separation.

Hold it consistently for
one week and notice the effect
on your child’s anxiety.

Why it works: Research on
environmental predictability
and early childhood anxiety
finds that consistent, predictable
routines significantly reduce
anxiety in very young children —
because they transform uncertain,
anxiety-provoking transitions
into predictable, manageable
events. The Predictable Routine
Builder makes this consistency deliberate and sustained.

The Bottom Line

Anxiety in children under
five is real, recognizable,
and significantly more common
than clinical referral rates
suggest. It speaks in the
language of stomachaches, clinging,
tantrums, and sleep difficulties —
not in the language of adult
anxiety — and recognizing it
in these presentations is
the first step toward helping.

The research is clear about
what helps most: secure, responsive
caregiving that provides the
felt safety that anxiety reduces;
gentle, supported approach
to feared situations that
builds confidence rather than avoidance;
consistent, predictable routines
that reduce environmental uncertainty;
and warm, calm parental presence
that provides the co-regulation
that very young children cannot yet provide for themselves.

The very young anxious child
needs above all else a parent
who is calm, present, and
confident in their capacity
to manage — and who communicates
that confidence through every
warm, regulated, brave-step-supporting
interaction.

Sources

Rapee, R. M., Kennedy, S.,
Ingram, M., Edwards, S., &
Sweeney, L. (2005).
Prevention and early intervention
of anxiety disorders in inhibited
preschool children.
Journal of Consulting and Clinical Psychology,
73(3), 488–497.

Kagan, J., Reznick, J. S., &
Snidman, N. (1988).
Biological bases of childhood shyness.
Science, 240(4849), 167–171.

Lebowitz, E. R. (2021).
Breaking Free of Child Anxiety and OCD.
Oxford University Press.

Ainsworth, M. D. S., Blehar, M. C.,
Waters, E., & Wall, S. (1978).
Patterns of Attachment.
Lawrence Erlbaum.