Medical Disclaimer: This is educational content only, not medical advice. Consult a licensed healthcare provider for diagnosis/treatment. Information based on sources like WHO/CDC guidelines (last reviewed: 2026-02-13).
This article is being expanded for more depth. Check back soon!
Medical Disclaimer: This is educational content only, not medical advice. Consult a licensed healthcare provider for diagnosis/treatment. Information based on sources like WHO/CDC guidelines (last reviewed: 2026-02-13).
Disorders of development are conditions in which a child fails to achieve expected developmental milestones in one or more domains such as gross motor, fine motor, language, social, or cognitive development.
Developmental delay means a child is slower than expected in achieving milestones, whereas developmental regression refers to loss of previously acquired skills and is always abnormal.
Global developmental delay is defined as significant delay in two or more developmental domains (motor, language, cognitive, social, or adaptive skills) in children under 5 years.
Common causes include genetic syndromes (Down syndrome, Fragile X), congenital infections (TORCH), birth asphyxia, prematurity, metabolic disorders, CNS infections, malnutrition, and environmental deprivation.
Red flags include no social smile by 3 months, not sitting by 9 months, not walking by 18 months, no single words by 16 months, no two-word phrases by 2 years, and any developmental regression.
Evaluation includes detailed prenatal, perinatal, and developmental history, milestone assessment, physical and neurological examination, screening tools, and targeted investigations.
Common tools include Denver Developmental Screening Test (DDST), Ages and Stages Questionnaire (ASQ), and M-CHAT for autism screening.
MRI is indicated when there is developmental regression, seizures, abnormal head size, focal neurological signs, or suspicion of structural brain abnormalities.
Hearing impairment is one of the most common and reversible causes of isolated speech delay, so hearing assessment is essential.
Autism is characterized by impaired social communication and repetitive behaviors, while intellectual disability involves global cognitive impairment with deficits in adaptive functioning.
Key investigations include hearing and vision testing, thyroid function tests, genetic testing (chromosomal microarray, Fragile X), and metabolic screening when regression is present.
Early intervention with physiotherapy, occupational therapy, speech therapy, and special education significantly improves developmental outcomes and quality of life.
Some causes are reversible, such as congenital hypothyroidism or hearing impairment, if treated early, while genetic and neurodegenerative causes are usually not reversible.
Management includes behavioral therapies such as Applied Behavior Analysis (ABA), structured educational support, speech therapy, and medications like risperidone for severe aggression if needed.
Key principles include early identification, multidisciplinary intervention, treatment of underlying causes, family counseling, and long-term developmental support.