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Neurodevelopment

Children's Mental Health

About 1 in 5 children experiences a mental health condition in a given year — yet most never receive care. Understanding what's typical, what's a concern, and what helps is one of the most important things a parent, caregiver, or educator can do.

15 min read Reviewed July 2026 Plain-language summary

The short version

  • Mental health conditions in childhood are common, real, and treatable — earlier identification leads to much better outcomes.
  • There's a wide range of normal development. Behavior that's concerning depends heavily on the child's age, duration, and impact on functioning.
  • ADHD, anxiety disorders, and autism spectrum disorder are among the most frequently identified conditions in children and teens.
  • Evidence-based treatments — play therapy, parent training, CBT adapted for children, and medication when appropriate — are effective.
  • Schools are a crucial partner: 504 plans, IEPs, and school-based counselors are available to eligible children.

Development matters: what's typical when

Child mental health is inseparable from development. A four-year-old having a tantrum, a nine-year-old worrying about school, and a thirteen-year-old pulling away from family are all developmentally normal — the same behaviors at different ages, or lasting far longer than expected, can signal something worth exploring.

The key questions are always: How long has this been happening? (Most transient difficulties resolve on their own.) How much is it getting in the way?(Does it interfere with learning, friendships, family life, or the child's own wellbeing?) And is it age-appropriate?

Age groupOften typicalWorth discussing with a clinician
Toddlers (1–3)Tantrums, separation anxiety, limited sharingNo single words by 16 months, no two-word phrases by 24 months, loss of previously acquired skills
Preschool (3–5)Fears, magical thinking, needing routinesExtreme aggression, inability to separate from caregivers, no interest in peers, persistent nightmares
School age (6–12)Rule-following, peer comparison, some worryingSchool refusal, severe perfectionism, persistent sadness, fire-setting, cruelty to animals
Adolescence (13–17)Identity exploration, risk-taking, mood swingsSelf-harm, substance use, prolonged withdrawal, dramatic weight change, talk of death or suicide

Regression under stress is normal

Children often temporarily regress — bedwetting again, wanting a bottle, clinginess — during major stressors like a move, divorce, or the birth of a sibling. Brief regression that resolves within a few weeks usually isn't a sign of disorder. Persistent regression or regression without an obvious cause is worth discussing with your pediatrician.

Warning signs worth taking seriously

While most childhood difficulties are transient, some warrant prompt attention. Seek evaluation — starting with your child's pediatrician or a mental health professional — if you notice:

  • Sudden or dramatic behavioral changesthat aren't explained by an obvious life event.
  • Persistent sadness or loss of interest in things the child used to enjoy, lasting more than two weeks.
  • Self-harm of any kind — cutting, burning, hitting oneself — or talk about wanting to be dead or disappear.
  • Extreme fears or worries that prevent normal activities (refusing to go to school, leave the house, eat, or sleep).
  • Significant changes in eating — restriction, bingeing, purging, or obsessive food rules.
  • Hearing or seeing things others don't, or thinking that seems confused, disconnected, or very unusual.
  • Substance use, especially in pre-teens or young adolescents, or any use that seems to be escalating.

If you're worried about safety right now

Call or text 988(Suicide & Crisis Lifeline) for immediate support, or take your child to the nearest emergency room. NH Rapid Response is also available 24/7 at 833-710-6477.

Common childhood mental health conditions

The following are among the most frequently identified mental health conditions in children and adolescents. None of them are caused by bad parenting — they arise from a complex mix of genetics, temperament, brain development, and environment.

Anxiety disorders

Anxiety disorders are the most common mental health conditions in childhood, affecting roughly 1 in 8 children. They include generalized anxiety disorder (worry about many things), separation anxiety disorder (distress when away from caregivers, most common in younger children), social anxiety disorder (fear of scrutiny or embarrassment), and specific phobias. Children with anxiety often avoid triggers — which provides short-term relief but maintains the anxiety long-term.

ADHD

Attention-deficit/hyperactivity disorder affects approximately 5–10% of school-age childrenand is the most common reason children are referred for mental health evaluation. It is characterized by developmentally inappropriate inattention, hyperactivity, or impulsivity. Contrary to popular belief, ADHD is not caused by too much screen time or sugar, and it is not just a"boy thing" — though girls are significantly underdiagnosed. See the Understanding ADHD guide for a full explanation.

Oppositional defiant disorder (ODD)

ODD involves a persistent pattern of angry or irritable mood, argumentative or defiant behavior, and vindictiveness that is more frequent or severe than typical for the child's developmental level. It often co-occurs with ADHD. ODD is best understood not as a child who "wants" to misbehave, but as one who is struggling to regulate big emotions and impulses — and who typically responds well to parent-training interventions and a structured, predictable environment.

Autism spectrum disorder (ASD)

Autism is a neurodevelopmental condition characterized by differences in social communication, restricted or repetitive interests and behaviors, and often sensory sensitivities. The spectrum is wide — some autistic people need substantial support; others live independently and may not be identified until adulthood. Early diagnosis (now possible as young as 18–24 months) and early intervention improve long-term outcomes significantly. ASD is not caused by vaccines.

Depression

Depression in children may look different than in adults — irritability is often more prominent than sadness, and children may have difficulty naming their emotional experience. Physical complaints (headaches, stomachaches) with no medical cause are common. Adolescent depression is serious: teen suicide is the second leading cause of death in 10–24 year-olds in the U.S.

Trauma responses

Children who experience abuse, neglect, domestic violence, parental loss, or community trauma can develop PTSD, behavioral changes, academic difficulties, and attachment problems. Children's trauma responses may look like acting out, aggression, or regression rather than classic PTSD symptoms. Trauma-informed care throughout the school and healthcare system makes a significant difference.

Many children meet criteria for more than one condition — comorbidity is the norm, not the exception. A good evaluation will assess the full picture rather than assigning a single label.

What helps: evidence-based treatments

Children's mental health treatment is most effective when it involves the child, the caregivers, and — when appropriate — the school, all working together. No single approach works for every child.

Play therapy

For younger children who lack the vocabulary or abstract thinking for traditional talk therapy, play is the primary language. Child-centered play therapy provides a safe, non-directive space where children process difficult experiences through play. Therapist-guided play can also teach coping skills, reduce anxiety, and improve self-regulation.

Cognitive behavioral therapy (CBT) for children

CBT adapted for children is the most evidence-supported psychological treatment across a wide range of conditions — particularly anxiety and depression. It teaches children to recognize unhelpful thought patterns, build coping skills, and gradually face fears rather than avoid them. Sessions typically involve games, worksheets, and developmentally appropriate activities. For trauma, Trauma-Focused CBT (TF-CBT) is the gold-standard approach.

Parent training

For ADHD, ODD, and behavioral difficulties, interventions that teach parents skills are often more effective than child-only therapy. Programs like Parent-Child Interaction Therapy (PCIT), The Incredible Years, and Parent Management Traininghelp caregivers create consistent structure, use effective praise, and respond to difficult behavior in ways that reduce rather than escalate it. This is not about blaming parents — it's about giving them powerful tools.

Medication

Medication is appropriate for some children when psychosocial approaches haven't been sufficient or when severity warrants it. For ADHD, stimulant medications are highly effective and have decades of safety data. For anxiety and depression in adolescents, SSRIs are sometimes used alongside therapy. Medication decisions should involve a careful risk-benefit discussion with a child psychiatrist or developmental pediatrician.

"Wait and see" has limits

A common and well-intentioned response is to hope a child will "grow out of it." While many difficulties do resolve, untreated mental health conditions in childhood can compound over time — affecting academic performance, friendships, and self-esteem in ways that persist into adulthood. Earlier treatment leads to better outcomes.

School-based services

Schools are a critical part of the children's mental health system in New Hampshire and across the country. Children spend more waking hours in school than almost anywhere else — and federal law requires schools to provide support for students with disabilities, including many mental health conditions.

What schools can provide

  • School counselors and social workers — available in most NH schools for short-term counseling, crisis support, and connecting families to community resources.
  • Special education (IDEA) — children with qualifying disabilities (including ASD, emotional disturbance, and sometimes ADHD) may be eligible for an Individualized Education Program (IEP), providing specialized instruction and related services.
  • 504 plans — under Section 504 of the Rehabilitation Act, students with disabilities that substantially limit a major life activity (including ADHD and anxiety) may qualify for accommodations: extended time, reduced distractions, preferential seating, and more.
  • Multi-tiered support systems (MTSS) — many NH schools use tiered systems that provide universal support to all students, targeted support to those at risk, and intensive intervention for those with the greatest needs.

How to request an evaluation

To request an IEP evaluation, put the request in writing to the principal or special education director. Schools have 15 business days to respond in NH. You don't need a clinical diagnosis first — the school conducts its own evaluation. If you disagree with the school's decision, you have the right to challenge it.

Supporting your child: what parents can do

A secure, supportive relationship with a caring adult is one of the strongest protective factors for children's mental health — more than any single program or therapy.

  • Take concerns seriously.Children rarely "make up" mental health symptoms for attention. Dismissing distress signals — even if you're not sure what's causing them — can increase shame and delay help.
  • Name it to tame it.Helping children label their emotions ("it sounds like you're really frustrated right now") builds emotional intelligence and reduces the intensity of emotional flooding.
  • Model coping. Children learn more from watching adults handle stress than from being told how. Visible use of calming strategies — deep breaths, taking space, naming your own feelings — teaches powerful lessons.
  • Maintain predictable routines. Structure, consistency, and predictability reduce anxiety and behavioral problems across virtually all childhood conditions.
  • Connect with other parents. Parenting a child with mental health challenges is isolating. Support groups (in-person and online) through NAMI, CHADD (ADHD), and similar organizations can help.
  • Take care of yourself.Caregiver burnout is real. You can't pour from an empty cup — and your own mental health directly affects your child's.

Find help in New Hampshire

New Hampshire has community mental health centers (CMHCs) in every region with dedicated children's services, as well as school-based programs, mobile crisis teams, and specialty programs for autism and early intervention.

  • Community mental health centers— the 10 NH CMHCs offer sliding-scale, insurance-accepted outpatient services for children and adolescents, including early intervention and intensive in-home support. Find your region's CMHC through NAMI NH.
  • Early Supports & Services (ESS)— for children birth to 3 with developmental concerns, NH's early intervention program provides free evaluation and services in the home. Referral through your pediatrician or by calling the local CMHC.
  • NH Rapid Response — mobile crisis team available 24/7 at 833-710-6477. Can come to the home or school for a child in crisis.
  • Project AWARE NH — a federally funded initiative that expands mental health services and training in NH schools.
Children's mental health services in New HampshireBrowse verified programs for children and adolescents by region — including school-based services, community centers, and early intervention.

References & further reading

  1. 1.American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.; DSM-5-TR). https://doi.org/10.1176/appi.books.9780890425787
  2. 2.Centers for Disease Control and Prevention. (2023). Children's mental health: Data and statistics. https://www.cdc.gov/childrensmentalhealth/data.html
  3. 3.Cohen, J. A., Mannarino, A. P., & Deblinger, E. (2017). Trauma-focused CBT for children and adolescents: Treatment applications. Guilford Press.
  4. 4.Eyberg, S. M., Nelson, M. M., & Boggs, S. R. (2008). Evidence-based psychosocial treatments for children and adolescents with disruptive behavior. Journal of Clinical Child & Adolescent Psychology, 37(1), 215–237.
  5. 5.Merikangas, K. R., et al. (2010). Lifetime prevalence of mental disorders in U.S. adolescents: Results from the National Comorbidity Survey Replication–Adolescent Supplement. Journal of the American Academy of Child & Adolescent Psychiatry, 49(10), 980–989.
  6. 6.NH Bureau of Children's Behavioral Health. (2024). Children's behavioral health in New Hampshire. https://www.dhhs.nh.gov/programs-services/mental-health/childrens-behavioral-health
  7. 7.Walkup, J. T., et al. (2008). Cognitive behavioral therapy, sertraline, or a combination in childhood anxiety. New England Journal of Medicine, 359(26), 2753–2766.

Also in the library

This page is general education, not medical advice or a diagnosis. Mental health conditions are best assessed and treated by a qualified professional. If you or someone else is in immediate danger, call or text 988(Suicide & Crisis Lifeline) or NH Rapid Response at 833-710-6477.