Developmental retardation is any significant lag in development in the any or all of the physical, cognitive, behavioral, emotional, or social spheres. Note that the term intellectual disability (mental retardation) refers to not merely a delay in development but rather a permanent limitation. Note that the term 'psychomotor retardation' is also used in some contexts to refer to a slowing of thought and physical movements as a result of major depression or intoxication.

A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.

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Retarded psychomotor development, Retarded development, Psychomotor delay, Developmental delay, global, Psychomotor developmental delay, Developmental retardation, Delayed cognitive development, Delayed developmental milestones, Retarded mental development, Delayed development, Psychomotor development deficiency, Developmental delay, Delayed milestones, Delayed psychomotor development, Developmental delay in early childhood, Motor and developmental delay, Psychomotor development failure, Lack of psychomotor development, Delayed intellectual development

Mental and motor retardation, Cognitive delay

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