01/10/2026
π§ Age-Wise Differential Diagnosis (CAP:Child and Adolescent Psychiatry)-Dr Bibhuti Bhusan Das, MD.
πΌ INFANCY (0β12 months)
Presenting Symptom Differential Diagnosis
Poor feeding / weight gain Neglect, GERD, metabolic disorder, maternal depression
Excessive crying Colic, sensory dysregulation, abuse, withdrawal
Poor eye contact Autism spectrum disorder (early), visual impairment
Flat affect Attachment disorder, maternal depression
Developmental delay Global developmental delay, genetic syndrome, cerebral palsy
Sleep disturbance Normal variant, neglect, regulatory disorder
β οΈ Always rule out medical causes first
πΌ TODDLER (1β3 years)
Presenting Symptom Differential Diagnosis
Speech delay Autism, hearing loss, intellectual disability
Frequent tantrums Normal development, sensory issues, trauma
Aggression Communication deficit, abuse, neurodevelopmental disorder
Separation anxiety Normal, anxiety disorder, attachment disorder
Loss of skills Autism regression, seizures, trauma
Hyperactivity Normal toddler behavior vs early ADHD
β οΈ Regression = red flag
π¨ PRESCHOOL (3β5 years)
Presenting Symptom Differential Diagnosis
Inattention ADHD, anxiety, sleep disorder
Aggression Trauma, ODD, modeling violence
Social withdrawal Autism, anxiety, selective mutism
Toileting problems Anxiety, abuse, developmental delay
Imaginary friends Normal development (NOT psychosis)
Nightmares Anxiety, trauma, normal fears
π Psychosis at this age is extremely rare
π« SCHOOL-AGE (6β12 years)
Presenting Symptom Differential Diagnosis
Poor academics ADHD, learning disorder, depression
Hyperactivity ADHD, anxiety, trauma
Defiance ODD, trauma, inconsistent parenting
Irritability Depression, anxiety, ADHD
Somatic complaints Anxiety, school refusal
Social problems Autism, ADHD, bullying
β οΈ School reports are essential
π§βπ EARLY ADOLESCENCE (10β13 years)
Presenting Symptom Differential Diagnosis
Mood swings Normal puberty vs depression
Irritability Depression, ADHD, trauma
Declining grades Depression, substance exposure
Peer conflict Social anxiety, bullying
Risk-taking Developmental vs impulse disorder
Sleep reversal Circadian shift vs depression
π Irritability often replaces sadness in youth depression
π§ MIDDLE ADOLESCENCE (14β16 years)
Presenting Symptom Differential Diagnosis
Depression MDD, substance use, trauma
Anxiety GAD, social anxiety, PTSD
Self-harm Depression, trauma, personality traits
Behavioral changes Substance use, mood disorder
Paranoia Anxiety, early psychosis, cannabis
Eating changes Eating disorder vs mood disorder
β οΈ Substance use mimics everything
π¨ LATE ADOLESCENCE (17β18 / up to 21)
Presenting Symptom Differential Diagnosis
Psychotic symptoms Schizophrenia, bipolar disorder, substances
Severe mood swings Bipolar disorder, trauma
Suicidality MDD, personality traits, crisis
Identity disturbance Normal development vs personality disorder
Functional decline Psychosis, depression
Legal problems Conduct disorder vs situational
π First-episode psychosis often appears here
π Golden Clinical Rules
Same symptom β same diagnosis at different ages
Trauma can masquerade as any disorder
Always rule out:
Medical β Developmental β Trauma β Substance β Psychiatric
π§ Ultra-Quick Memory Aid
βMAD T-Sβ
Medical
Anxiety
Developmental
Trauma
Substance
Run this checklist for every child & adolescent.