Manual of Child Neurology: Problem Based Approach to Common Disorders

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Since the last century, remarkable advances at both the basic and clinical levels have considerably improved our ability to evaluate and treat children with neurological disorders. Many cases seen by ...
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Developmental Disorders

Pp. 21-26 (6)

Mohammed M.S. Jan


Developmental disorders are a group of early and chronic disorders affecting 5-10% of children. Developmental delay is a subtype defined as significant delay in two or more of the following developmental domains: motor (gross and fine), language (receptive an expressive), cognition, social and adaptive activities. The estimated prevalence of global developmental delay is 1-3% of children younger than 5 years. Developmental delay is a clinical presentation of a wide variety of congenital or acquired etiologies. It results in significant learning deficits incompatable with the child’s chronological age. Significant delay in a given developmental domain is defined as performance two standard deviations or more below the mean for age. The term developmental delay is usually reserved for younger children (less than 5 years of age), whereas the term mental retardation is usually applied to older children when IQ testing is more reliable.


Neurological, Development, Disorders, Assessment, Delay, Regression, Evaluation, Mental retardation, Genetic, Metabolic.


Professor & Consultant of Pediatric Neurology Department of Pediatrics Faculty of Medicine King Abdulaziz University Jeddah Kingdom of Saudi Arabia