Child Psychiatry

Last updated: March 29, 2026

What cannot be communicated to the mother, cannot be communicated to the self – John Bowlby

Changes DSM-IV to DSM-V

  • Mental retardation has been renamed to Intellectual disability (Intellectual developmental disorder)
    • Needs an assessment for both cognitive capacity (IQ) and Adaptive functioning
    • Severity is now determined by adaptive functioning rather than cognitive function (IQ score)
  • Reorganization of the autism spectrum disorders
  • Rett syndrome has been removed from the DSM (genetic mutation and molecular etiology are now known; still similar to autism and still a pervasive developmental disorder)
  • Communication disorders
    • Language disorder now combines an umbrella disorder, combining expressive and mixed receptive-expressive language disorder
    • Speech sound disorder is renamed from “phonological disorder.”
    • Childhood-onset fluency disorder, re-named from “stuttering.”
    • Social (pragmatic) communication condition is a new condition for persistent difficulties in social uses of verbal and non-verbal communications. Differentiate from autism spectrum (social communication disorders are one component of ASD)
      • A. Persistent difficulties in the social use of verbal and non-verbal communication as manifested by all of the following
        • Deficits in using communication for social purposes, such as greeting and sharing information in a manner appropriate for the social context
        • Impairment of the ability to change communication to match context or the needs of the listener, such as speaking differently in a classroom than on a playground, talking differently to a child than to an adult, and avoiding use of overly formal language
        • Difficulties following rules for conversation and storytelling, such as taking turns in conversation, rephrasing when misunderstood, and knowing how to use verbal and non-verbal signals to regulate interaction
        • Difficulties understanding what is not explicitly stated and non-literal or ambiguous meanings of language
      • B. Deficits result in functional limitations in effective communication, social participation, social relationships, academic achievement, or occupational performance, individually or in combination
      • C. The onset of symptoms is in the early developmental period (but deficits may not become fully manifest until social communication demands exceed limited capacities)
      • D. The symptoms are not attributable to another medical or neurological condition or to low abilities in the domains of word structure and grammar, and are not better explained by ASD, intellectual disability, global developmental delay, or another mental disorder.

Overview

Mental health in childhood and adolescence is defined as the achievement of expected developmental, cognitive, social, and emotional milestones, and by secure attachments, satisfying social relationships, and the acquisition of effective social skills.

Children are not “small adults”. Their psychiatry is different, as is the rest of their physiology. Various stages of development are present from infant to adult (this continues on into the mid-20s, 23 – 25 years). Children experience a similar spectrum of psychiatric illnesses, but symptoms will be different. Family therapy plays a prominent role in therapy. Childhood psychiatric disorders should be viewed in the context of the family, social, and cultural setting since children lack certain capacities and perspectives and are vulnerable.

Categories of childhood illnesses

CategoryDescription
Disorders of cognitionIntellectual disability, Learning disorder (specifiers of reading, writing, or mathematics)
Pervasive developmental disordersAutism spectrum disorder (autism, asperger’s syndrome, childhood disintegrative disorder), Rett syndrome (removed from DSM-5)
Communication disordersLanguage disorder, speech sound disorder, childhood onset fluency disorder (stuttering), social pragmatic communication disorder
Behavioural disordersAttention deficit hyperactivity disorder (ADHD), oppositional-defiant disorder, conduct disorder, tourette’s syndrome
Other disordersChidhood enuresis, childhood anxietis, developmental coordination disorders, stereotypic movement disorders, tic disorders

Physical and Social Milestones

An overview of physical and social milestones

AgeMilestones
0-6 monthsrolls over, smiles and laughs, passes objects hand to hand, places objects in the mouth, vocalises syllables
6-12 monthscrawls, sits unsupported, stands with support, finger-thumb opposition, shy with strangers
1-2 yearswalks, runs, 3-word sentences, feeds with a spoon, parallel play
Early infancycontinent, draws figures, asks questions, hops, dresses, and undresses, cooperative play
Middle childhoodschooling, peer group activities, developing autonomy
Adolescenceincreasing independence, autonomy, and peer group activities

Freud’s Psychosexual Stages of Development (1856 – 1939)

Freud’s theory of psychosexual development focused on the effects of the sexual pleasure drive on the mind. He believed that at particular points along the developmental path, a body part is sensitive to sexual, erotic stimulations (erogenous zones – mouth, anus, and genitals)

Psychosexual stages

Age (years)StageFeatures
0 – 1OralGratification is achieved through oral means (breastfeeding)
1 – 3AnalGratification is achieved by the child’s perceived ability to control their anal sphincter (defecation)
3 – 6PhallicGratification is achieved (in the male child) through awareness of the phallus (penis)
6 years to pubertyLatencySexual development is latent as intellectual/social growth becomes more prominent
Puberty and beyondGenitalSexual desires are rekindled

Piaget’s Stages of Cognitive Development (1896 – 1980)

Piaget provided an account of cognitive development whereby the child increases their capacity to understand the world. His theory claims that children are unable to perform certain tasks until they are psychologically mature to do so.

Paget’s stages of cognitive development

StageAge RangeDescription
Sensorimotor0-2 yearsA child’s experiences come through the senses. Driven by motor development. Coordination of senses with motor response, sensory curiosity about the world. Language used for demands and cataloging. Object permanence developed
Preoperational2-7 yearsAcquisition of motor skills. Linguistic skills develop (drive). Symbolic thinking, use of proper syntax and grammar to express full concepts. Imagination and intuition are strong, but complex abstract thought is still difficult. Conservation developed.
Concrete operational7-11 yearsChildren begin to think logically about concrete events. Concepts attached to concrete situations. Time, space, and quantity are understood and can be applied, but not as independent concepts
Formal operations11+Development of abstract reasoning. Theoretical, hypothetical, and counterfactual thinking. Abstract logic and reasoning. Strategy and planning become possible. Concepts learned in one context can be applied to another

Erickson’s Stages of Psychosocial Development (1833 – 1887)

Erikson listed 8 stages across the entire life span in which successful completion (resolution of a conflict/task) leads to a favourable result (virtue). He emphasised the importance of the ego (executive function of the mental apparatus) in personality development, instead of focusing on the basic drives as Freud did.

Erickson’s Stages of Psychosocial Development

StageTaskVirtue
0-2 yearstrust vs mistrustHope
1-2 yearsautonomy vs doubtWill
3-6 yearsinitiative vs inadequacyPurpose
6-pubertyindustry vs inferiorityConfidence
Adolescenceidentity vs confusionFidelity
Early adulthoodintimacy vs isolationLove
Late adulthoodgenerativity vs stagnationCare
Old ageintegrity vs despiarWisdom

Bowlby and Ainsworth’s Attachment Theory

Attachment is the making of a strong, affectionate relationship with others. It is a characteristic of human beings and other species. Stable relationships are a source of enjoyment and security, while separation, loss, or threatened loss of a relationship is a source of anger, sadness, and depression. Attachment theory is the current dominant theory in child psychiatry

The Circle of Security

In the circle of security, “The Strange Situation’ paradigm by Ainsworth is used to assess attachment and early physiological difficulties. Children are observed playing for 20 minutes while caregivers and strangers enter and leave the room. The amount the child explores and engages, and the child’s reaction to the departure and return of the caregiver, are observed. Based on these, the attachment style is categorized, and management implications are decided.

In the top half of the circle, the child feels safe and secure, and there is a natural tendency to explore the world. The role of the parent is to watch over without taking over.

In the bottom half, the child is tired, frightened, or no longer interested in exploring and needs to return to safety.

Reference Intervals
Biochemistry
ACTHP: <80 ng/L
ALTP: 5–35 U/L
AlbuminP: 35–50 g/L
AldosteroneP: 100–500 pmol/L
Alk. phosphataseP: 30–130 U/L
α-AmylaseP: 0–180 IU/dL
α-FetoproteinS: <10 kU/L
Angiotensin IIP: 5–35 pmol/L
ADHP: 0.9–4.6 pmol/L
ASTP: 5–35 U/L
BicarbonateP: 24–30 mmol/L
BilirubinP: 3–17 μmol/L
BNPP: <50 ng/L
CRPP: <10 mg/L
CalcitoninP: <0.1 mcg/L
Calcium (ionized)P: 1.0–1.25 mmol/L
Calcium (total)P: 2.12–2.60 mmol/L
ChlorideP: 95–105 mmol/L
CholesterolP: <5.0 mmol/L
VLDLP: 0.128–0.645 mmol/L
LDLP: <2.0 mmol/L
HDLP: 0.9–1.93 mmol/L
Cortisol AMP: 450–700 nmol/L
Cortisol MidnightP: 80–280 nmol/L
CK ♂P: 25–195 U/L
CK ♀P: 25–170 U/L
CreatinineP: 70–100 μmol/L
FerritinP: 12–200 mcg/L
FolateS: 2.1 mcg/L
FSHP: 2–8 U/L ♂; >25 menopause
GGT ♂P: 11–51 U/L
GGT ♀P: 7–33 U/L
Glucose (fasting)P: 3.5–5.5 mmol/L
Growth hormoneP: <20 mu/L
HbA1C (DCCT)B: 4–6%
HbA1C (IFCC)B: 20–42 mmol/mol
Iron ♂S: 14–31 μmol/L
Iron ♀S: 11–30 μmol/L
Lactate (venous)P: 0.6–2.4 mmol/L
Lactate (arterial)P: 0.6–1.8 mmol/L
LDHP: 70–250 U/L
LHP: 3–16 U/L
MagnesiumP: 0.75–1.05 mmol/L
OsmolalityP: 278–305 mosmol/kg
PTHP: 0.8–8.5 pmol/L
PotassiumP: 3.5–5.3 mmol/L
Prolactin ♂P: <450 U/L
Prolactin ♀P: <600 U/L
PSAP: 0–4 mcg/mL
Protein (total)P: 60–80 g/L
Red cell folateB: 0.36–1.44 μmol/L
Renin (erect)P: 2.8–4.5 pmol/mL/h
Renin (recumbent)P: 1.1–2.7 pmol/mL/h
SodiumP: 135–145 mmol/L
TBGP: 7–17 mg/L
TSHP: 0.5–4.2 mU/L
T4P: 70–140 nmol/L
Free T4P: 9–22 pmol/L
TIBCS: 54–75 μmol/L
TriglyceridesP: 0.50–2.3 mmol/L
T3P: 1.2–3.0 nmol/L
Troponin TP: <0.1 mcg/L
Urate ♂P: 210–480 μmol/L
Urate ♀P: 150–390 μmol/L
UreaP: 2.5–6.7 mmol/L
Vitamin B12S: 0.13–0.68 nmol/L
Vitamin DS: 50 nmol/L
Arterial Blood Gases
pH7.35–7.45
PaCO₂4.7–6.0 kPa
PaO₂>10.6 kPa
Base excess±2 mmol/L
Urine
Cortisol (free)<280 nmol/24h
Hydroxyindole acetic acid16–73 μmol/24h
Hydroxymethylmandelic acid16–48 μmol/24h
Metanephrines0.03–0.69 μmol/mmol cr.
Osmolality350–1000 mosmol/kg
17-Oxogenic steroids ♂28–30 μmol/24h
17-Oxogenic steroids ♀21–66 μmol/24h
17-Oxosteroids ♂17–76 μmol/24h
17-Oxosteroids ♀14–59 μmol/24h
Phosphate (inorganic)15–50 mmol/24h
Potassium14–120 mmol/24h
Protein<150 mg/24h
Protein/creatinine ratio<3 mg/mmol
Sodium100–250 mmol/24h
Haematology
WCC4.0–11.0 ×10⁹/L
RBC ♂4.5–6.5 ×10¹²/L
RBC ♀3.9–5.6 ×10¹²/L
Hb ♂130–180 g/L
Hb ♀115–160 g/L
PCV ♂0.4–0.54 L/L
PCV ♀0.37–0.47 L/L
MCV76–96 fL
MCH27–32 pg
MCHC300–360 g/L
RDW11.6–14.6%
Neutrophils2.0–7.5 ×10⁹/L (40–75%)
Lymphocytes1.0–4.5 ×10⁹/L (20–45%)
Eosinophils0.04–0.44 ×10⁹/L (1–6%)
Basophils0–0.10 ×10⁹/L (0–1%)
Monocytes0.2–0.8 ×10⁹/L (2–10%)
Platelets150–400 ×10⁹/L
Reticulocytes0.8–2.0% / 25–100 ×10⁹/L
Prothrombin time10–14 s
APTT35–45 s
Paediatric
Pulse Rate (bpm)
Neonate140–160
Infant <1yr120–140
1–5 years110–130
5–12 years80–120
>12 years70–100
Respiratory Rate (tachypnoea)
0–2 months≥60/min
2–12 months≥50/min
1–5 years≥40/min
>5 years≥30/min
Blood Pressure (mmHg)
Term65/45
1 year75/50
4 years85/60
8 years95/65
10 years100/70
Weight Formulas
3–12 months(a + 9)/2 kg
1–6 years2a + 8 kg
>6 years(7a − 5)/2 kg
Haemoglobin (g/dL)
Term newborn13–20
1 month11–18
2 months10–15
1–2 years10–13
>2 years11–14
MUAC (6 months–5 years)
Obese>17.5 cm
Normal13.5–17.4 cm
At risk12.5–13.4 cm
Moderate malnutrition11.5–12.4 cm
Severe malnutrition<11.5 cm
Developmental Milestones
Social smile1.5 months
Head control4 months
Sits unsupported7 months
Crawls10 months
Stands unsupported10–12 months
Walks12–13 months
Talks18 months
CSF WBC (/mm³)
Term newborn0–25
>2 weeks0–5
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